Hi and thanks for looking.
We have a main site in the South East of the UK and a satellite branch in Birmingham (we moved offices 4 months ago to a new site). We have a Multisite WAN with our ISP, we run a 30mb Fiber at our main site and bonded dsl in Birmingham (10mb circuit). We run a DB server (Filemaker) at the main office which our satellite offices connect to over the WAN. Birmingham branch experiences lag and incerdibly slow speeds when doings lookups or finds or when copying data from our fileserver and all ping tests I run from the 3 machines up there (two macs and a win 7 machine) get 12% or more packet loss when pinging our router or DB server in the main office, however our ISP tells me they cannot replicate this from the router.. We have replaced the CAT5 cabling at the branch and our ISP sent an engineer to check the other hardware wasn't to blame which I'm told is all functioning fine.
Getting super frustrated now and would like a fresh opinion on the possible reasoning behind this. Think I've included all the details but feel free to ask anymore questions!!
Thanks for looking.