Such thing as malpractice administrator blocking ICMP and

From: johngibson1541@yahoo.com
Date: Sat Jun 23 2007 - 10:31:55 ART

They have a list of sites blocking ICMP
and web users can only do path mtu discovery
to do the right thing.

http://www.netheaven.com/pmtulist.html

among which aol.com is one of those.

Is that page legitimate? How could there
be such a big problem in aol.com when
millions are happily using it?

If they have "tcp adjust-mss" at their router
for tcp connections, web users will be fine.
Only issue will be aol.com's own admins that
use SNMP (UDP).

Maybe the page's author doesn't know about
"tcp adjust-mss"?

I use wireshark to monitor my own packets
to download http pages (almost all pages
today in mail.yahoo or are bigger than 1500).

I have never seen my Linux PC sending out
any path MTU discovery.

My PC's default mss is 1460.

I still believe Linux (mine is fedora) does
not have TCP ECN by default.

John

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