Hi, eventuell hilft folgendes:
These are packets that Linux does not expect from the direction they came from (i.e. packets from internal hosts coming in on the external interface). The cause is probably a misconfigured machine on your LAN. You can turn off logging those packets via /proc/sys/net/ipv4/conf/*interface*/log_martians which is documented in /usr/src/linux/Documentation/proc.txt
...or you have got no default route to your ISP's IP, especially if you have a PPP connection to the ISP. IPPP seems to drop default routes if you do not place a '-defaultroute' in /etc/ppp/options.ippp0 (I found this out the hard way this weekend. Perhaps the normal PPPD does the same?)
Ich habe soetwas sehr oft mit "problematischen" Win und/oder Macs gesehen. HTH Tom