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Not all verizon users...
Authored by: thatch on Jul 12, '02 02:18:23AM

I have verizon dsl with a DHCP ethernet connection and don't have any problem sending email from Eudora. I am running 10.1.5 and have MTU 1500 as seen in my system log.

I don't know where I heard it, but isn't this problem only with PPPoE?



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Found it
Authored by: thatch on Jul 12, '02 02:30:35AM

It was on MFI that this was mentioned. Scott Boone reported, "The MTU, or Maximum Transfer Unit, is the largest allowable packet size, in bits, that IP will attempt to send. When using PPPoE, 8 bits of that packet is used for the PPPoE in-band signaling (IIRC), and an Ethernet packet larger than that will monkey up some PPPoE implementations".

So this may not be verizon specific but rather PPPoE specific.



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MTU applies to all packets
Authored by: gancho on Nov 20, '04 09:43:06PM

MTU applies to all packets sent, not just IP packets. ICMP echo request packets are limited to the MTU size as well, for example.



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Not all verizon users...
Authored by: kushu on Jul 14, '02 02:38:46AM

though...

Occasionally you still have MTU problems with MTU=1500 and Verizon's PPPoE, i.e., try to go to http://homelink.fleet.com, if you stuck with their web site, you might better set the MTU to 1492 (PPPoE limits the MTU <= 1492.)

Verizon is the one to blame, the second is PPPoE...



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Not all verizon users...
Authored by: mannyde on Aug 05, '03 11:50:32AM

Just to add my 2 cents to this. Last year when I first starting using my linksys router with my ADSL connection at home I was having problems getting to some Web sites. With the help of a coworker we traced it down to an MTU problem. I ended up putting an MTU setting of 1400 in the router's configuration and no problem after that. Yes, it seems to be a problem with PPOE, but not everyone experiences this.



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