Sanity check my thought process - Internet Connect Cisco Issue
I would like to sanity check my and everybody in my offices thought process on this one. We have a client who intermittently see's the internet connection drop, We are always able to see the router on its internal and external addresses (both public). What we are not able to see is the Watchguard firewall on the other side of the router. (see attached image - IPS are not correct but just examples).
During a period of outage the connection between the Cisco and the Watchguard goes down - a duplex mismatch maybe... no both set to 100 Full (already tried that). EDIT: The Watchguard is set to 100 Full, the Cisco auto as when set to 100 full too we got TTL expired in transit
But what I have noticed is that if from my office I ping the cisco on both its external and internal public IP I get a TTL of 246 (which is correct as 9 router hops to the Cisco), from my office to the Watchguard the TTL is 54! So between the Cisco and the Watchguard which is a direct connection they are losing 192 hops somewhere.
The other strange thing is to bring the line back up you can either reset the Watchguard OR the rad unit. Both of these devices bring the line up.
Now in my head I am pointing at the Cisco being at fault for some bizarre reason. The ISP have gone away to look as to what could be causing the issue, but the guy i've been speaking with thinks it could be the firmware on the Rad unit.
For anybody not familiar with the Rad unit its this EFM DSL Network Termination Unit LA-210 essentially a termination unit for the EFM line which basicly provides the facility to bond the (in this case) 4 pairs.
Any body any ideas what else it could be? Am I right in thinking this is an issue with the cisco router? (model unknown).
EDIT: could a mod change the title to Sanity check my thought process - Internet Connection Cisco Issue