Can I have some help with an explanation of the following message in the log. I'm just getting started with GRE. It seems to be working. The log message was caused by a rule in the iptable INPUT chain.
"DROP icmp" is my own log hdr. eth2 is the external device with IP address 68.15.53.174 which is the local end of the GRE tunnel. 68.15.53.176 is the remote end of the tunnel. Where does 10.4.56.1 come from? What does the stuff in [ ] mean? Below is the message. Apr 29 13:18:43 allsrv01 kernel: DROP icmp IN=eth2 OUT= MAC=00:c0:f0:45:76:18:00:05:5f:e9:9c:54:08:00 SRC=10.4.56.1 DST=68.15.53.174 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=53630 PROTO=ICMP TYPE=5 CODE=1 GATEWAY=68.15.53.176 [SRC=68.15.53.174 DST=68.15.53.176 LEN=64 TOS=0x00 PREC=0x00 TTL=126 ID=0 DF PROTO=47 ] Mark Orenstein
