Firewall Wizards mailing list archives
Re: Inappropriate TCP Resets Considered Harmful
From: Sally Floyd <floyd () aciri org>
Date: Sat, 12 May 2001 22:45:52 -0700
Having said that, maybe you should suggest a more appropriate firewall response? IMHO (and I'm no RFC guru) I'd say that discarding the packet and sending an ICMP parameter problem error might be more informative.
Yep, the next revision of the draft might try to include a suggestion of a more appropriate response than a reset. (Unfortunately, one problem with ICMPs is that they might be blocked by a firewall on the reserve path, it would seem.)
For the time being, though, wouldn't it be better to make ECN implementations deal with TCP RSTs (as in try and resend in non-ECN mode)?
My own opinion would be that ECN implementations should be made as robust as possible to deal with TCP RSTs, and *at the same time* system administrators should be encouraged not to send resets in response to Reserved flags in the TCP header. Perhaps the next revision of the draft on "Inappropriate TCP Resets Considered Harmful" will be more convincing. - Sally http://www.aciri.org/floyd/ _______________________________________________ firewall-wizards mailing list firewall-wizards () nfr com http://www.nfr.com/mailman/listinfo/firewall-wizards
Current thread:
- Inappropriate TCP Resets Considered Harmful Sally Floyd (May 10)
- FW Sequence Number based statefulness Nimesh vakharia (May 11)
- Re: FW Sequence Number based statefulness Carson Gaspar (May 13)
- <Possible follow-ups>
- RE: Inappropriate TCP Resets Considered Harmful dave . goldsmith (May 11)
- RE: Inappropriate TCP Resets Considered Harmful Ben Nagy (May 11)
- RE: Inappropriate TCP Resets Considered Harmful Ofir Arkin (May 13)
- Re: Inappropriate TCP Resets Considered Harmful Darren Reed (May 13)
- Re: Inappropriate TCP Resets Considered Harmful Sally Floyd (May 13)
- Re: Inappropriate TCP Resets Considered Harmful Darren Reed (May 14)
- RE: Inappropriate TCP Resets Considered Harmful Ben Nagy (May 14)
- RE: Inappropriate TCP Resets Considered Harmful Ben Nagy (May 14)
- Re: Inappropriate TCP Resets Considered Harmful Darren Reed (May 14)
- RE: Inappropriate TCP Resets Considered Harmful Ben Nagy (May 16)
- RE: Inappropriate TCP Resets Considered Harmful Crispin Harris (May 16)
- RE: Inappropriate TCP Resets Considered Harmful Crispin Harris (May 16)
- FW Sequence Number based statefulness Nimesh vakharia (May 11)