I am trying to setup dual DSL links using multilink PPPoE at a location and have it working about 99% of the way. This is to replace an existing T1. The only issue I have is that SOME (and it is limited) web sites will not load, one of the being http://www.microsoft.com. Go back to the T1, loads right up. If the site supports pinging then I am able to ping the address from either the multilink PPPoE or T1. Also, is seems like all other services - FTP, SSH, Telnet seem to be working on either link. Speed tests from our web site do show speeds that let us know the multilink is functioning.
The configuration between the two is the same as far as IP addresses and they are both terminating on the same network as well for the other end. I have fiddled with the MTU/MRU/MRRU in the Mikrotik to no avail at this point based on some stuff I have seen searching. The far end of the DSL connection is a DS3 ATM connection on a Cisco 3700. This is also hardware under our control/configuration and we have tried a couple of things there as well.
It is driving me crazy and any help would be appreciated. We are running Mikrotik v3.17. Thanks!