nanog mailing list archives
Re: black listing of web traffic
From: Jim Shankland <nanog () shankland org>
Date: Tue, 09 Feb 2010 13:55:59 -0800
Andrey Gordon wrote:
Can't find my IP on any of the black lists. Don't have any proxies. Sites that behave poorly are consistent. That is to say that facebook.com, apple.com would always come up without an issue, but cnn.com, forever21.com(i know, don't ask, students), store.apple.com would consistently take forever to come up. Just wanted to check of rate-limiting web clients is a common practice nowdays in the industry. If it's not, it's probably an unlikely cause of my troubles...
Other things you might want to check out include whether your NAT gateway is well-behaved in the presence of PMTU discovery, TCP timestamps, and ECN. The web sites your students are having trouble with may share some property that, correctly or not, is interacting poorly with your NAT implementation. (I remain astonished at the number of "big name" web sites out there that send out their content with the DF bit set, then drop the "fragmentation required" ICMP packets they get back on the floor.) Jim Shankland
Current thread:
- black listing of web traffic Andrey Gordon (Feb 09)
- Re: black listing of web traffic Chris Campbell (Feb 09)
- Re: black listing of web traffic Jon Lewis (Feb 09)
- Re: black listing of web traffic Tony Finch (Feb 09)
- Re: black listing of web traffic Jon Lewis (Feb 09)
- Re: black listing of web traffic Tony Finch (Feb 09)
- Message not available
- Re: black listing of web traffic Andrey Gordon (Feb 09)
- Re: black listing of web traffic Jim Shankland (Feb 09)
- Re: black listing of web traffic Jay Hennigan (Feb 09)
- Re: black listing of web traffic Andrey Gordon (Feb 09)
- Message not available
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- Re: black listing of web traffic Andrey Gordon (Feb 09)
- Re: black listing of web traffic Valdis . Kletnieks (Feb 09)
- Re: black listing of web traffic gordon b slater (Feb 09)
- Re: black listing of web traffic Andrey Gordon (Feb 09)
- Re: black listing of web traffic gordon b slater (Feb 09)
- Re: black listing of web traffic Rogelio (Feb 09)
- Re: black listing of web traffic Andrey Gordon (Feb 09)
- Re: black listing of web traffic Chris Campbell (Feb 09)