I am installing a 12.04 server which has two NICs with a static private and static public IP. For some reason the public IP is accessible for about 10 minutes and then the connection drops. When I log into the server and do an arp-scan eth0, then suddenly I can reach it from the public IP again. The WAN is behind a firewall. The syslog doesn't show anything out of the ordinary. Is there anything I can check within the server NIC settings?
Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Speed: 100Mb/s Duplex: Half Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: off MDI-X: Unknown Supports Wake-on: umbg Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes