What is your network setup/topology? In short, this is an ICMP redirect sent by 10.4.56.1 to 68.15.53.174 saying that if you want to send packets to 68.15.53.176 send it to 68.15.53.176 and not me (10.4.56.1). This does not make sense, right? But in order to fully explain the why/how/who/what you have to tell us the topology.
Ramin On Mon, Apr 29, 2002 at 03:47:50PM -0400, Mark Orenstein wrote: > 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
