I am experiencing an intermittent problem when accessing files across an MPLS cloud. Specifically, the errors occur in any of the three following scenarios:
1. Remote users attempting to access files at their local office via remote VPN. VPN is terminated at HQ concentrators first, users then traverse MPLS cloud to local office.
2. Local users traverse MPLS cloud from local office to HQ file servers.
3. Users at HQ attempting to access files at local office across MPLS cloud.
The errors that we are running into vary from write failures upon opening remote files, to transfers stalling, to transfers terminating, to file inaccessible errors.
Topography - (local/remote office server) - (rack switch) - (router + MPLS) - (AT&T demark) (MPLS Cloud) - (demark) - (router + MPLS) - (switch) - (HQ office)
The MTU sizes vary between the two head end routers - one is 1470 and the other is 1524 - would this have an impact end to end or am I correct in my understanding that MTU size only matters to next hop?
At this point I have isolated the issue to the router itself, however, being intermittent (meaning I don't hear about an occurence until the day after it happens) I am having a problem gathering data on the issue for troubleshooting.
My question is essentially this - has anyone else here experienced similar or like problems who is willing to point me in the right direction or able to give me likely sources to begin checking?