Hi JohnvD and all other,
kernel: IP_MASQ:reverse ICMP: failed checksum from 195.64.6.130!
I'd like to know if 195.64.6.130 is your IP? Surely?!
Dec 28 00:10:33 zwiffelzwaffel kernel: IP_MASQ:reverse ICMP: failed checksum from 213.7.32.37!
It seems that your masquerading fails for 213.7.32.37. Another point can be the masquerading and/or forwarding set (misconfigured?). Maybe also an attack is possible.... But if I read:
Dec 28 12:17:51 zwiffelzwaffel kernel: eth1: Setting Rx mode to 1 addresses.
Two years ago (something around this :) i got the same message and after five days the nic 'died'.... Perhaps try to deactivate all unnecessary masquerading modules & rules. If you have another netcard, maybe the replacement works... Hope you get it solved, Johannes