Thread: Weird network problem with ubuntu only

i running out of ideas here.

run small home server using ubuntu , dnsmasq.
worked fine until few days ago, when noticed unable ssh/ping other ubuntu machine on private lan.
explain:

• all clients have correct static or dynamic address delivered using dhcp
• all dns requests resolved properly, returning ipv4 addresses expected
• all network clients able access internet
• all network clients able access server
• all non-ubuntu network clients can pinged, accessed using ssh/http , on (openwrt, debian)
• ubuntu clients cannot access other ubuntu clients exception of server

example:

• server ip 192.168.1.1, client1 ip 192.168.1.2 (ubuntu), client2 ip 192.168.1.3 (ubuntu), client3 192.168.1.4(openwrt)
• on server, ping client1 works fine, ping client2 works fine
• on client1, ping 192.168.1.1 works fine, ping 192.168.1.3 ends "destination host unreachable"
• on client2, ping 192.168.1.2 ends "destination host unreachable"
• on client1, ping 192.168.1.4 works fine
• on client3, ping 192.168.1.2 or 192.168.1.3 works fine

thought has ipv6, disabling did not help.
also, trying ping/ssh using ipv4 address , hostname no success here.
please, advice should next.

hi rklauco.

explain little bit 'topology' of network? is, how devices connected each other?

post these commands both server , client1?

code:

ifconfig  route -n

regards.

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