VPN problem with Tomato router

I’ve network issues with OSX 10.9 PPTP clients over TP-Link NAT firewalls. Connection and authentication work like a charm, but read/write calls produced GRE errors like this:

GRE: read(fd=7,buffer=419884,len=8260) from network failed: status = -1 error = Message too long

The solution: set MTU and MRU values to 900 instead of default 1450 at PPTP Server tab.

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