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A side note on the MTU configuration - you might want to try setting mtu 1492 instead of ip mtu 1492 on the dialer. The former should cause PPP to correctly negotiate the link MTU as part of the LCP negotiations. I have had similar experiences, and...
We've experienced similar problems with our Unity configuration and gone back and forth on whether it's a hardware or a software issue. We're at the point of doing a conversion of our secondary server to a primary, then rebuilding our former primary...