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Change Log

All notable changes to the project are documented in this file.

v4.6 - 2024-11-10

This release is a major refactor of the internal timer and socket handling, it also contains a major speedup of the peering of DVMRP routers at startup.

Fixes

  • Issue #56: ensure group timers are stopped when stopping interfaces
  • Issue #56: replace homegrown timer and socket handling with pev v2.0. The existing timer implementation was too imprecise and jittered several seconds between query intervals
  • Issue #64: fix compiler warnings when building with 64-bit time_t targeting 32-bit platforms (only affects logging and status output)
  • Fix mroutectl show routes, locally connected routes never expire
  • Skip timeout of subordinates at startup
  • Minor compiler warnings on non-Linux systems

Changes

  • Check interface status and update internal state on more error codes instead of logging sendto() or sendmsg() failure
  • Revert change in TIMER_INTERVAL from v4.0, update interval is now 5 seconds instead of 2
  • Removed internal log rate limiter, demystifies behavior and greatly simplifies the code
  • Log interface names with their assigned VIF number to ease debugging
  • Speed up peering by sending route reports as soon as one-way peering has been established
  • Updates to logging, clarifying source 0.0.0.0 of routes as "us", and add logging when adding and discarding groups to/from interfaces
  • Use (S, G) format for all logging
  • Silence bogus Failed MRT_DEL_MFC warnings for routes never added to the MRIB due to missing reverse path

v4.5 - 2023-06-04

Fixes

  • Ignore IGMP proxy querys (src ip: 0.0.0.0), they must never win a querier election.
  • Fix compat read location and new location for mrouted.genid
  • Fix "non-decreasing" generation id, must increment on each restart

Changes

  • Add support for configurable IGMP query response interval
  • Add support for configurable IGMP querier timeout
  • New join-group <group> phyint option for cases where an IGMP snooping switch blocks flooding of multicast to the port where mrouted is connected
  • On startup and reconf, log why we skip disabled interfaces
  • Change to always log when assuming the IGMP querier role

v4.4 - 2021-11-03

Changes

  • Rename tunnel vifs, from base interface, to use the Linux kernel naming; dvmrpN, where N is the VIF number. Other kernels may handle this differently, patches to support other nomenclatures are most welcome!
  • Logging to stdout now always prefixes messages with the daemon ident
  • If adding a tunnel VIF and Linux does not have ipip.ko loaded, mrouted logs this as a warning message
  • Add test for IPIP tunnels
  • Add Docker container image, see https://ghcr.io/troglobit/mrouted
  • Update mping testing tool to v1.6 (internal)
  • Refactored linked-list handling in unicast route engine (internal)
  • Drop experimental RSRR feature. It is very likely unused these days, seeing as the draft memo never made it into widespread use. It is also not working properly with multiple instances of mrouted

Fixes

  • Issue #52: IP-IP tunnels don't work anymore. Somewhere in the big refactor for the mrouted v4.x series, the tunnel directive in the .conf parser was never adapted to the new internals
  • Fix a 10 year old regression after a linked-list refactor, causing off-by-one (loss of one) in unicast route distribution. Which in turn cause VIF tunnels to malfunction

v4.3 - 2021-09-19

Changes

  • Add support for -i,--ident=NAME to change identity of an instance
  • Add support for -p,--pidfile=FILE to override default PID file
  • Touch PID file at SIGHUP to acknowledge done reloading .conf file
  • Add support for -t,--table-id=ID, multicast routing tables (Linux)
  • Add support for -u,--ipc=FILE to override /var/run/mrouted.sock file, used for communication with mroutectl

Fixes

  • Fix segfault when parsing phyint lines in .conf file interface cannot be found, e.g., phyint eth1 static-group 225.1.2.5
  • Prevent cascading warnings when phyint interface names cannot be found

v4.2 - 2021-01-07

Major bug fix and feature release. Support for static routes and improved configuration support for IGMP.

Changes

  • Support for controlling IGMP Last Member Query Count using the igmp-robustness setting in mrouted.conf, default 2
  • Support for tuning the IGMP Last Member Query Interval using a new setting igmp-query-last-member-interval <1-1024>. Issue #44
  • Support for static multicast routing (*,G), similar to SMCRoute. New phyint static-group GROUP setting in mrouted.conf, multiple statements supported, but no ranges (yet). Issue #31
  • Proper tracking of lower-version host members (IGMP), when a lower version host is detected for a group, a timer is set according to RFC3376, and while in this compat mode higher-version IGMP is not allowed to change state. E.g., in IGMPv1 compat, IGMPv2 LEAVE is ignored for the group, similar to the phyint being in igmpv1 mode
  • Allow IGMP reports from source address 0.0.0.0, required as per RFC3376, sec. 4.2.13, not supported until now. This should greatly improve interop with IGMP snooping switches and DHCP clients that have not yet received a lease
  • Improved support for running mroutectl under watch(1). No more artifacts due to unknown ANSI escape sequences to probe width
  • Delayed PID file creation until after initial startup delay, there is nobody home until after that delay, so no point in announcing availability until after that

Fixes

  • Issue #43: IGMPv3 membership reports were parsed incorrectly. The problem affects users that use source specific multicast join, i.e., (S,G) join/leave using IGMPv3. Support for IGMPv3 was introduced in mrouted v4.0
  • Issue #46: Malformed group-specific IGMP query. The IGMP header no longer had the group field set, despite the query being addressed to a specific group. Regression introduced in v4.0
  • Issue #47: The optional phyint flag igmpv3 did not work.
  • Fix buffer overrun in descriptor poll() handling
  • Fix double-close on SIGHUP, Linux systems only
  • Various non-critical memory leak fixes, critical for no-MMU systems

v4.1 - 2020-10-02

Minor feature and bug fix release.

Changes

  • Issue #40: Automatically detect and add altnet to interfaces with multiple addresses, possible thanks to work on #36
  • Reduce number of exposed aliases to debug sub-systems in online help text and man page. Only primary name, as of mrouted v3.9-beta3
  • Removed noisy timer sub-system from -d all, use -d all, timer
  • Document a lot of mrouted.conf options available in this version of mrouted since before v3.9, but not in the OpenBSD, based on v3.8:
    • prune-lifetime
    • rexmit-prunes
    • phyint and tunnel interface flags:
      • advert-metric
      • allow-nonpruners
      • blaster
      • force-leaf
      • noflood
      • passive
      • prune-lifetime
      • rexmit-prunes
    • The tunnel option beside off
    • Router filtering options with accept, deny, and notransit

Fixes

  • Fix update of mrouted.genid on SIGHUP and reboot. mrouted replaced contents with the value zero (0), causing a zero genid in DVMRP as well, which likely caused peering issues with some implementations
  • Fix build warning on Clang 3.4.1 (FreeBSD 10.3)
  • Workaround for older autoconf without --runstatedir support
  • Fix double free in pidfile()
  • Fix #35: Cannot disable multicast routing in kernel: Permission denied when starting up.
  • Fix #36: Refactor interface probing and bringup. Fixes issue with the no phyint config option not working, introduced in v4.0
  • Fix #37: Fix bad path for mrouted.genid, should be in /var/lib/misc on Linux and /var/db on *BSD
  • Fix #38: Document and improve error message when running out of IGMP groups on Linux. When running with many interfaces
  • Fix #40: Detect and warn if multicast ingresses an unknown vif

v4.0 - 2020-06-09

Major release with full IGMPv3 (ASM) support and a new mroutectl tool.

Note: command line options have been changed!

Changes

  • Support for IGMPv3, both sending queries and accepting membership reports, issue #16

  • Support for configurable IGMP query interval, issue #26

  • Support for configurable IGMP robustness variable, issue #27

  • Incompatible command line option refactor

  • New directive in mrouted.conf: no phyint, reverses the default behavior of mrouted. Interfaces can then selectively be enabled

      no phyint
  phyint eth1 enable
  phyint eth2 enable

  • Support for disabling the IP router-alert option:

      no router-alert

  • Add systemd unit file

  • Introduce mroutectl, a helpful tool to interact with mrouted. This completely replaces mrouted.cache and mrouted.dump, including SIGUSR1 and SIGUSR2 signals, which are now ignored, issue #24

  • The mrouted.pid file, and the new mrouted.sock file, are now located in /var/run

  • Major cleanup of logging directives read from the command line, and from mroutectl. Use -d ?, and -l ? to list alternatives

  • GNU Configure & Build system, use ./autogen.sh only when building directly from GIT sources, otherwise use ./configure from tarball

Fixes

  • Fix #20: Replace obsolete gethostbyname() w/ getaddrinfo()
  • Fix #25: Save mrouted.genid to persistent store in /var/lib instead of /var/run
  • Fixed libc portability issues, e.g. GNU:isms like %m etc.
  • Import OpenBSD fix to daemon() equivalent, use /dev/null for stdin, stdout and stderr
  • Use clock_gettime(), with monotonic clock, instead of the unsafe gethostbyname(), for all non-date-printing code paths. Only for mrouted, other tools have not been changed
  • Fix lots of invalid format specifiers, found by Coverity Scan and clang on FreeBSD
  • Fix detection of netinet/igmp.h on FreeBSD
  • Fix memory leaks in mrouted on SIGHUP

v3.9.8 - 2017-01-01

Changes

  • New option -D or --startup-delay to tune the initial delay during which routes are exchanged, but not applied.
  • The mrouted man page has been cleaned up and sections clarfied.
  • Add -D_DEFAULT_SOURCE for building on GLIBC v2.20, and later.
  • Sync with OpenBSD mrouted

Fixes

  • Matt Weber found and fixed a serious bug with DVMRP reports missing subnet (off by one error) which seems to have been introduced in v3.9.5. Issue #14
  • Fix mtrace compilation with Clang 3.5, fix courtesy of FreeBSD, https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196166, by Dimitry Andric (@DimitryAndric), heads-up by Olivier Cochard-Labbé (@ocochard)
  • Minor warnings from scan-build (clang) also fixed. See the GIT log for more details.

v3.9.7 - 2014-12-28

Changes

  • SNMP Support removed. It never compiled and would have likely needed a complete refactor to support modern AgentX.
  • Replaced static config.mk with configure script from pimd
  • RSRR Support disabled by default, use --enable-rsrr to configure script
  • Add 'enable' to phyint directive and -M/-N command line options, thanks to Joseph Gooch (@goochjj)
  • Add David Waitzman and Craig Partridge to list of original authors after being contacted by Mr Waitzman :)
  • Change to use stdint.h types instead of type unsafe homegrown types

Fixes

  • Fix issue with older BSD kernels, mainly for current FreeBSD 10 and older, that don't really give RAW sockets but byte swap ip_len field, Olivier Cochard-Labbé (@ocochard)
  • Build fixes for FreeBSD, should make maintaining ports easier :)
  • Change from select() to poll() due to descriptor limits, e.g., on BSD.
  • UNIX 2038 first audit, inspired by OpenBSD. Cleanup type confusion int/u_long where it should be time_t. Also, clarify that genid is OK since it is used and stored as an unsigned 32-bit integer.
  • Lots of minor fixes detected by Coverity Scan and Clang scan-build https://scan.coverity.com/projects/3320

v3.9.6 - 2011-10-23

Changes

  • The Makefile now accepts CFLAGS from the environment instead of simply overriding. The old USERFLAGS variable, previously intended for this purpose, is still supported for backwards compatibility reasons.

Fixes

  • Serious regression in route.c, introduced in 3.9.5, caused by the link list refactor. Fix by Seth Hinze [email protected]
  • Fix GCC 4.6 warnings for unused variables.

v3.9.5 - 2011-03-05

Changes

  • The location of dump files have been moved from /var/tmp to /var/run/mrouted due to the insecure nature of /var/tmp. See more below.
  • Add -r,--show-routes which sends SIGUSR1 to a running daemon, waits for the file /var/run/mrouted/mrouted.dump to be updated, and then displays the result on stdout.

Fixes

  • The linked list implementation used in route.c caused several problems and as a result has been refactored. This fixes several SIGSEGV crashes a couple of memory leaks as well as GitHub issue #7.
  • Ported from pimd after CVE-2011-0007: Insecure file creation in /var/tmp:
    "On USR1, pimd will write to /var/tmp/pimd.dump a dump of the multicast route table. Since /var/tmp is writable by any user, a user can create a symlink to any file he wants to destroy with the content of the multicast routing table."

v3.9.4 - 2010-11-19

Fixes

  • kern.c:k_del_vif() does not work properly in Linux.

    When some interface (known by mrouted) goes down, mrouted tries to remove related VIF by calling stop_vif(), which in turn calls k_del_vif(). After k_del_vif() is called, mrouted exits with the following error:

    "setsockopt MRT_DEL_VIF on vif 3: Invalid argument"

    The reason for this is due to differences in the Linux and *BSD MRT_DEL_VIF API. The Linux kernel expects to receive a struct vifctl associated with the VIF to be deleted, *BSD systems on the other hand expect to receive the index of that VIF.

    Fix contributed by Dan Kruchinin mailto:[email protected]

v3.9.3 - 2010-10-11

Changes

  • Update man page with --long-options, missing sections and improve debug help.
  • Cleanup Makefile for use with BSD PMake as well as GNU Make.

Fixes

  • Fix NULL pointer dereference in conf file parser. Problem will arise for all interfaces that at one point might not have an address.

    Reported by Dan Kruchinin mailto:[email protected]

  • Fix problem with running the tunnel directive on OpenVPN, PPTP, L2TP tunnels as well as PPP links. All of which use a 255.255.255.255 netmask on their interfaces.

    See http://openvpn.net/archive/openvpn-users/2004-04/msg00003.html for original problem report.

    Fix contributed by Dan Kruchinin mailto:[email protected]

  • route.c:accept_probe(): Fix missing check of malloc() return value.

  • vif.c:SetTimer(): Dito.

  • route.c:accept_report(): Fix potential stack overflow issue. Also added checks to prevent overstepping array boundaries in local rt[] array when parsing route report messages.

v3.9.2 - 2010-08-16

Changes

  • Reduce code duplication on platforms carrying strlcpy() and strtonum().

Fixes

  • Fix file paths for GNU/Linux installations, they too use /var/tmp rather than /usr/tmp today.
  • Code fixes in RSRR code (disabled by default).
  • Fix possible build error in strtonum.c on platforms not supporting LLONG_MIN/MAX

v3.9.1 - 2010-04-10

Biggest news in this release is that all OpenBSD patches as of this date are merged.

Changes

  • Change license to 3-clause BSD on mrinfo, RSRR and mrouted sources, thanks to hard working OpenBSD team!
  • Support for older yacc versions.

Fixes

  • OpenBSD, all patches from their CVS repository have been merged. Things like missing free for malloc, missing checks for malloc return value, restart syscalls after signal (EINTR). As well as a heap of neat code cleanup and modernization.

v3.9.0 - 2010-01-23

Changes

  • Debian, build fixes for GNU/Linux.
  • FreeBSD ports collection, major API cleanups.
  • Buildroot, some minor cleanups of old deprecated APIs
  • Philippe Troin mailto:[email protected], added more compiler warnings and fixed the problems uncovered by that.

v3.9-beta3 - 1999-04-26

Changes

  • A blaster keyword for mrouted.conf, to turn on handling of routers (mostly ciscos) which overwhelm the socket buffers by blasting the whole routing table at once.
  • A notransit keyword; routes learned on a notransit vif will not be readvertised onto another notransit vif.
  • The 500 kbps default rate limit on tunnels has been removed.
  • An ICMP listener which logs ICMP errors which appear to be in response to tunnel packets that we sent.
  • A tunnel traffic encapsulator, which encapsulates control traffic inside the tunnel instead of unicasting it beside the tunnel. This is turned off by default; use beside off to turn it on.
  • A force_leaf flag to ignore any potential neighbors on a given interface.

Fixes

  • There was a bug handling routing updates which caused random black holes.
  • There was a race condition in the timer handlers causing free'd memory to sometimes get touched.
  • allow_nonpruners wasn't allowed in the configuration file (and almost nobody noticed! - probably a good sign)
  • When a prune times out and the source has been active "recently", mrouted now waits for further traffic instead of triggering a new prune.
  • mrouted now ignores unreachable routes when making a routing decision (previously it would blackhole, now it can find a less-specific)

v3.9-beta2 - 1997-06-11

There is no need to upgrade to 3.9-beta2 if you are not experiencing one of the following bugs.

Fixes

  • There was a bug in 3.9-beta1's raw socket buffer processing that would cause an immediate lockup on startup on some systems.
  • RSRR would not clear out the group membership information if further notification of changes to this route entry was not possible.

v3.9-beta1 - 1997-06-06

Changes

  • Longer prune lifetimes (2 hours) by default. Prune lifetimes may be configured per-vif, with the prune_lifetime N mrouted.conf configuration file entry (where N is in seconds). This helps to work around the black holes caused on restart when you have a Cisco upstream which does not handle genid's; if this is your situation the recommended value is 300.
  • mrouted's behavior of flooding new routes by default at startup in order to speed healing of paths during startup can be turned off per-vif or globally with the noflood configuration option. Turning this option off means you are likely to experience black holes for a minute or two when you restart a router. The default is to flood for a minute or two until mrouted is able to learn subordinate relationships.
  • mrouted now retransmits prunes by default on point-to-point links. The mrouted.conf command rexmit_prunes [on|off] can be used to enable or disable this feature on a per-vif basis. Prune retransmission helps on lossy links, and also helps when a router has forgotten about a prune (e.g. if it is out of memory and needs to shed state, or due to a bug).
  • The new passive mode causes mrouted to not actively send probes looking for neighbors. This allows a dialup link to become quiescent if there is no DVMRP neighbor on the other end. Configuring passive on both ends of a link will cause it to never come up.
  • mrouted defaults to not peering with DVMRP routers that do not prune. Use the allow_nonpruners mrouted.conf option on a vif on which you want to allow such peerings.
  • mrouted now allows route filtering using allow and deny in mrouted.conf:
    • Only accept or deny is allowed, no combinations.
    • Add bidir to apply the filter to output too, otherwise it's input only.
    • Expected usage:
      • Providers filter routes that customers send them
      • Martian removal
      • Topology modification (e.g. don't let the existence of private tunnel foo out into the world).
    • Syntax:
      • accept 13/8 :: All routes matching 13/8 (e.g. 13.2.116/22)
      • accept 13/8 exact :: If you want to accept exactly 13/8
      • deny 10/8 64/2 130/8 exact 172/8 exact :: Common MBone martians
  • mrouted now malloc's the buffer it uses for SIOCGIFCONF, to allow for more interfaces. Thanks to Danny Mitzel
  • mrouted now ignores multiple entries for a single interface name (temporary hack until mrouted understands interface aliases)
  • mrouted's -d flag has been modified to accept the names of the systems which you would like to debug: packet, prunes, routes, peers, cache, timeout, interface, membership, traceroute, igmp
  • mrouted now times neighbors out fater, and fully detects and ignores routes from one-way peerings.
  • mrouted's route processing has been sped up, especially at startup.
  • mrouted uses the biggest SO_RCVBUF the operating system allows (up to 256 kb)
  • mrouted uses TOS 0xC0 ("Internet Control") for DVMRP messages.

Known Issues

  • The startup message doesn't print properly if you have too many interfaces.

Fixes

  • mrouted did not properly keep track of subordinates, and would not time out subordinateness. This caused 2 major problems:
    1. pruning did not happen when there were equal-cost paths to the same multi-access link
    2. subordinateness which did not get cancelled by a non-poisoned route (e.g. in the face of route filtering) did not time out, causing traffic to continue to flow.
  • mrouted's IGMPv2 processing when it is not the querier now conforms to draft-ietf-idmr-igmp-v2-06.txt Thanks to Lorenzo VICISANO mailto:[email protected] for finding a problem.
  • mrouted is much more careful about forgetting prunes; 3.8 would forget prunes whenever any route change ocurred.

v3.8 - 1995-11-29

Fixes

  • mrouted would fail to forget prunes when a neighbor went away, thus potentially sending traffic down a tunnel after the tunnel endpoint has gone down. This was due to some research code making it into the "emergency" 3.7 release, sigh.
  • mrouted could send prunes with negative lifetimes. This causes slightly higher prune traffic but shouldn't be any major problem.

Manifest

README-3.8.mrouted this file
mrouted/* version 3.8 of mrouted, mrinfo, map-mbone and mtrace.
ifconfig/* Changes to ifconfig to show multicast interfaces
netstat/* Diffs to netstat
ping/* sources for ping which support multicasting
mtest/* utility for testing multicast group membership

v3.7 - 1995-11-28

Changes

  • The configuration file can accept a hostname as the other end of a tunnel. There must be a single name-to-ip mapping for the given name, however, or mrouted will fail to start up.
  • mrinfo now sends requests to all interfaces of a multihomed host.
  • mtrace's passive mode has been implemented.
  • The first screen of mtrace statistics is shorter and more likely to fit on one screen.

Fixes

  • mrouted now ignores route reports that include bogus netmasks. There was a bug in 3.5 that would mangle default routes into tens of bogus routes; this should prevent that bug from killing the MBONE.

    This solution can cause route flaps and black holes until the 3.5's are gone or all of the 3.5's neighbors are 3.7 .

  • mrouted now ignores duplicate routes. Ciscos and the above 3.5 bug could cause two copies of the same route to appear in a single routing update; mrouted would insert two copies of the same route into its routing table and wreak all sorts of havoc.

  • mrouted now sends a group-specific query for both retransmissions of a g-s query; previous versions sent a general query the second time.

  • mrouted now loops back multicasted mtrace responses and group-specific membership queries

  • mrouted now performs deterministic tiebreaking between two neighbors on the same vif.

  • mrouted now only does duplicate suppression on traceroute requests, not all traceroute packets, so that a loop can be nicely detected via a duplicate router instead of just a timeout.

  • the buffer size that mrouted uses has been increased to allow more than 16 hops in mtrace messages.

  • mtrace's hop-by-hop termination is now more likely to be correct.

  • mrinfo now waits for the responses to its retransmitted queries.

v3.6 - 1995-06-26

Fixes

  • mrouted would dump core when attempting to report no routes (i.e. upon startup, if you have no enabled phyint's)
  • mrouted would dump core if requested to traceroute a source for which it had no route
  • neighbor flags were not always properly updated on probe or report
  • mrouted would sometimes reply to a multicast traceroute on a disabled phyint; now it uses the first configured phyint to reply to traceroutes.
  • host routes (i.e. netmask 0xffffffff) works now; it was discarding IGMP from the host because it was coming from the "broadcast address" of the subnet.
  • send_igmp() now treats the failure to send an mtrace or a neighbor reply as informational, as opposed to warning.
  • mrouted would go into an infinite loop trying to respond to a traceroute for a source with a netmask of 0xffffffff.
  • vifs_with_neighbors was not being reset if the mrouted was restarted with SIGHUP.
  • the default route was not being properly advertised to neighbors (although it was accepted if it was advertised to it)
  • ANSI-fication for those who it helps, still-K&R-ish for those it doesn't.
  • mtrace now attempts to trace three hops past a non-responding router, in the hopes that it does support traceroute but just couldn't respond (i.e. unicast didn't work and it can't source multicast because all its phyints are disabled).
  • mrinfo now times out even on a multicast router.

v3.5 - 1995-05-08

Changes

  • The kernel and mrouted make sure that each is the correct version, to prevent problems with mismatched kernel/mrouted versions. A too-old mrouted will die with the error:
    "can't enable DVMRP routing in kernel: Option not supported by protocol"
  • mrouted can accept and propogate a default route (essential for heirarchical multicast routing)
  • Kernel route cache keeps source-specific routes instead of subnet routes, eliminating hashing and longest-match problems. (allows classless routing, longest-match and default routing)
  • Cached kernel routes only get deleted if no traffic is flowing, to facilitate multicast traceroute
  • mrouted has a new configuration file parser, which provides better error messages than before, and allows named boundaries (see man page)
  • added netmask to phyint configuration, at the suggestion of Anders Klemets
  • System V and FreeBSD compatibility from John Brezak mailto:[email protected]
  • phyint's can have additional subnets configured, for people with multiple subnets on one physical network. mrouted.conf syntax is altnet 1.2.3.0, or altnet 1.2.3.0/24 if you need to specify a different netmask. There can be as many altnet statements as you need.
  • both mrouted and the kernel now support classless addresses.
  • the kernel supports PIM assert processing by notifying the router when a packet arrives on the wrong interface
  • the kernel keeps additional counters, and mrouted can be compiled to support SNMP and the Multicast MIB
  • the packet classifier in the kernel now uses the following udp port ranges. A future release of a session directory will allocate ports in these ranges:
    • [0, 16384): lowest priority, unclassified
    • [16384, 32768): highest priority, i.e. audio
    • [32768, 49152): medium priority, i.e. whiteboard
    • [49152, 65536): low priority, i.e. video
  • the configuration code has been modified to default tunnels' rate_limit parameters to 500kbps. This is easily modified with a rate_limit keyword in mrouted.conf, but should be a good default for the MBONE in general.
  • The tunnel sending code now caches a route for ip_output(), this should help performance on machines with lots of tunnels.
  • Dispatching for de-capsulating packets is now via protosw[], making reception of other raw protocols more efficient
  • Neighbor capabilities are discovered via a bitmask as opposed to version number.
  • Multicast traceroute code improved
  • mrouted can be compiled with Routing Support for Resource Reservation (RSRR), required for RSVP.

Fixes

  • The IGMPv2 query timeout field was interpreted as being in units of 200ms as opposed to 100ms, thus the maximum timeout was set to twice the expected value. This is not fatal, as mrouted always queries twice in the expectation that a packet could get loss, but it does make it less robust in the face of packet loss.
  • IGMP could report membership in local-only groups (i.e. 224.0.0.X)
  • IGMP could get confused by hearing its own new membership reports, thus a router would never perform fast leave.
  • IGMP could reset timers for the wrong interface.
  • mrouted put a bogus value in the maximum timeout field of IGMPv2 query packets.
  • Non-querier mrouters would respond to IGMP leave messages
  • mrouted was not performing fast leave properly
  • If the last member goes away on a transit network, the upstream router would stop forwarding even if there are downstream members.
  • Kernel hash function improved
  • Eliminated possibility of panic(): timeout in cache maintenance
  • Reordered resource allocation when sending upcall to handle failure properly
  • some endian-ness bugs squashed in mrouted, probably more to go.
  • Multicast traceroute could send a reply on a disabled interface.