mejor MTU ADSL une MDE
http://web.archive.org/web/20120713013303/http://www.mynetwatchman.com/kb/ADSL/pppoemtu.htm
http://www.tp-link.us/FAQ-190.html
http://blog.theliel.es/2011/10/redes-%C2%BFmtu-maximo-u-optimo-para-conexiones-xdsl.html
http://superuser.com/questions/759444/on-a-pppoa-adsl-connection-what-is-the-best-mtu-size
http://packetlife.net/blog/2008/aug/18/path-mtu-discovery/ !!!!!!
http://stevedischer.com/pmtu-and-mss-discovery-issues-resolved-with-mikrotik/
https://samuel.kadolph.com/2015/02/mtu-and-tcp-mss-when-using-pppoe-2/
https://kb.juniper.net/InfoCenter/index?page=content&id=KB28670&smlogin=true&actp=search