É, se as redes 192.168.2.0/24 e 172.16.1.0/24 compartilham a mesma placa de rede e uma funciona, a hipótese do defeito na placa ou nos cabos está descartada.
Vamos olhar então outra causa provável, o firewall. Posta a saída do comando abaixo.
sudo iptables -L -v -n
sudo iptables -t nat -L -v -n
OK feito
root@serverlan:~# iptables -L -v -n
Chain INPUT (policy ACCEPT 21M packets, 15G bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 14M packets, 6484M bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 24M packets, 18G bytes)
pkts bytes target prot opt in out source destination
root@serverlan:~# iptables -t nat -L -v -n
Chain PREROUTING (policy ACCEPT 2475K packets, 200M bytes)
pkts bytes target prot opt in out source destination
268K 13M REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
Chain POSTROUTING (policy ACCEPT 15674 packets, 2296K bytes)
pkts bytes target prot opt in out source destination
2153K 167M MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
130 38102 MASQUERADE all -- * eth0 0.0.0.0/0 0.0.0.0/0
0 0 MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 402K packets, 28M bytes)
pkts bytes target prot opt in out source destination
Talvez não seja um trem a luz no fim do tunel... hehehe
Obrigado