traceroute results differs between a Win PC and a Cisco router
I'm experiencing a pretty weird packet behaviour when issuing a traceroute from two different devices: a Windows PC and a Cisco router.
When tracing from a PC in the LAN, I can see the router's ethernet interface (used as the destination address) responding as the last hop for the trace.
When I do the same thing using an extended trace from the router where my default gateway is setup and issuing the source address as the router's ethernet address, the remote end responds me back with the serial ip address of the destination router as the last hop. this is usually what uses to happedn when we extended trace from LAN-to-LAN in Cisco routers and I'd like to know why it differs from a PC in the LAN.
Re: traceroute results differs between a Win PC and a Cisco rout
Hi Stevens, thanks for your initial feedback anyway. I'll try to lay out what I'm trying to understand. I have the following picture:
PC ---- Router1 ----Wan---- Router2
When I do tracert from PC using Windows towards the ethernet address of Router2, I got a response from that specific ip address, as being the last hop for my tracert command. When issuing a extended traceroute from Router1, using as source address Router1's ethernet ip address and destination Router2' ethernet ip address, thr remote end give me as the last hop for my tracerouter command, the ip associated with the Wan link (serial port) and not effectively the ethernet address which I'm trying to reach. So I'm wondering why do wenhaqve two different behaviors within this scenario. I did some debug in the remote end router and could realize that in addition to the UDP packet, the windows PC send some regular echo request packets and receives replies as well. Hope it's more clear now.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.