Question

1

How can I set the destination to "anywhere" in the iptables?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1247 / 11 Months ago, fri, december 9, 2022, 8:16:31

As far as i understood with the following rule:

ACCEPT     tcp  --  anywhere             172.17.0.4           tcp dpt:25565

ubuntu allows connection via port 25565 but only to 172.17.0.4, but i want it to be reachable from anywhere.
Ive tried something like

sudo iptables -A INPUT -p tcp --dport 25565 -j ACCEPT -d anywhere

but that doesn't work. Am I missing something? Maybe im totally wrong i don't know much about networking. My server i want to reach runs in a docker container if that makes any differences.

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sweetrifiabl

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answered 10 Months ago aslity · Accepted Answer

You can omit the "-d ...", but INPUT is just to your local device.

When your destination is in another network (even if it is a virtual network) you need forwarding:

echo 1 > /proc/sys/net/ipv4/ip_forward

And the FORWARD chain is the right place to put your rules (but "ACCEPT" should already be the default)

Hint: iptables -S outputs the rules in the command-format