On a PPPoA ADSL Connection - What is the best MTU Size

ADSL MTU - 1472 vs. 1492 | MyBroadband Forum Mar 16, 2007 Troubleshooting MTU Size in PPPoE Dialin Connectivity - Cisco Feb 26, 2008

MTU Problems - kitz.co.uk - DSL Broadband Information

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How can I optimize PPPoE connections? | SonicWall

Mar 20, 2012 Understanding MTU and MRU Configuration for PPP MX Series. PPP MTU and MRU for PPPoE Subscribers, PPP MTU and MRU for Tunneled Subscribers on LNS