iptables Rule Not Working as Expected

[RonaldFletcher]

Environmental Info:
K3s Version: v1.28.14+k3s1

Node(s) CPU architecture, OS, and Version: 5.15.0-122-generic #132-Ubuntu SMP Thu Aug 29 13:45:52 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Describe the bug:

I'm encountering an issue when trying to add an IPTABLES NAT rule. The command I executed is:

iptables -t nat -A OUTPUT -p tcp --dport 10351 -j DNAT --to 192.168.50.132:10003

Despite no errors when applying the rule, it doesn't seem to be working. Connections to port 10351 are not being forwarded to 192.168.50.132:10003 as expected.

Steps To Reproduce:
Add the following NAT rule:

iptables -t nat -A OUTPUT -p tcp --dport 10351 -j DNAT --to 192.168.50.132:10003

Try to access the service via port 10351.
Observe that the request is not properly redirected.

Expected behavior:

Connections to port 10351 should be redirected to 192.168.50.132:10003

Actual behavior:

No redirection occurs, and the service behind 192.168.50.132:10003 remains inaccessible via port 10351.

Additional context / logs:

[RonaldFletcher]

Do I need to turn on any configurations, or is this what k3s is designed for?