My organisation has DSL/VDSL access services where we use a modem in transparent bridge & a Mikrotik as the router. PPPoE on the Mikrotik.
What we find, is that whenever these services drop for any reason, a number of them will either not re-authenticate, or take a long time to re-authenticate.
What I've found from speaking with our upstream carrier, is that their BRAS have a MAC learning limit of 1. They are seeing that they are learning the MAC address from the modem in transparent bridge, when they shouldn't be. This is causing the MAC Address table on the BRAS to not learn the Mikrotik MAC, so PPPoE tunnel cannot be established to pass credentials. It's not possible for the carrier to increase MAC learning limit.
The modem we are using is the Netcomm NF10WV. I'm trying to find a setting/reason for why this is happening, but I'm unable to. I'm also wondering if this is expected behavior that the modem in transparent bridge doesn't share it's MAC address upstream. Firmware is up to date on the modems also.
Any ideas/thoughts?
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