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System and Network configuration • Network connectivity across VLANs: no ping

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Debian 12 (VLAN10) pinging to VLAN20 fails:

Code:

ping 192.168.20.1PING 192.168.20.1 (192.168.20.1) 56(84) bytes of data.From 192.168.16.1 icmp_seq=1 Destination Host UnreachableFrom 192.168.16.1 icmp_seq=2 Destination Host UnreachableFrom 192.168.16.1 icmp_seq=3 Destination Host UnreachableFrom 192.168.16.1 icmp_seq=4 Destination Host UnreachableFrom 192.168.16.1 icmp_seq=5 Destination Host UnreachableFrom 192.168.16.1 icmp_seq=6 Destination Host Unreachable
Firewall allows everything from Debian (VLAN10) to (VLAN 20). A Raspberry Pi on VLAN 10 pings as expected. Nothing shows in router logs.

I also don't understand how IP changes from 192.168.20.1 to 192.168.16.1 (not knowingly using that IP range).

Maybe this is helpful:

Code:

traceroute 192.168.20.1traceroute to 192.168.20.1 (192.168.20.1), 30 hops max, 60 byte packets 1  192.168.16.1 (192.168.16.1)  3052.804 ms !H  3052.771 ms !H  3052.761 ms !H

How do I troubleshoot this? I'm in well over my head. Thanks!

Statistics: Posted by devNull — 2025-12-27 22:58



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