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doc: firewall: example port is 443

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Solène Rapenne 2023-11-03 15:03:14 +01:00
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user/security-in-qubes/firewall.md
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@ -433,10 +433,10 @@ Sometimes these logs can contain useful information about errors that are preven
An effective console utility to troubleshoot network is [tcpdump](https://www.tcpdump.org/), it can be used to display network packets entering or leaving network interfaces.
For instance, if you want to check if your network interface `eth0` is receiving packets on port TCP 22 from the network 192.168.x.y, you can run this command:
For instance, if you want to check if your network interface `eth0` is receiving packets on port TCP 443 from the network 192.168.x.y, you can run this command:
```
tcpdump -i eth0 -nn dst port 22 and src net 192.168.x.y/24
tcpdump -i eth0 -nn dst port 443 and src net 192.168.x.y/24
```
This can be used effectively in a destination qube and its Network VM to see if forwarding / NAT rules are working.