Date: Mon, 29 Jan 1996 03:34:00 -0800 From: David Greenman <davidg@Root.COM> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@freebsd.org Subject: Re: Why RFC1323 is disabled on freefall and freebsd.cdrom.com ? Message-ID: <199601291134.DAA00305@Root.COM> In-Reply-To: Your message of "Mon, 29 Jan 1996 12:18:42 %2B0100." <199601291118.MAA05320@labinfo.iet.unipi.it>
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>1) extensions (really, TCP options) are negotiated. If the server > does _not_ request for possibly unknown extensions, but merely > respond to incoming requests, I do not see how this could do > any harm. I don't know if FreeBSD requests for extensions even > in the LISTEN state, but disabling this should require trivial > changes to the kernel (and it would probably be a good idea to > implement such a behaviour). The problem isn't the negotiation - this happens just fine. The problem is with certain terminal servers that won't pass packets with TCP options in them. The options negotiation succeeds, but all the packets from that point on are dropped. >2) the "99.999%" may be an exaggeration, but to me it means "never". > This might be a bad idea for more useful options (such as > selective ACKs). Actually, 99.999% is probably not enough. 1 in 100000 people means I'll be getting a trouble report every 5 days (sooner now that I've upgraded the machine to handle 600 users - the traffic has almost doubled since I last calculated the people/day statistic). >Note however that the two sites that do use RFC1323 are large >servers, comparable (or larger) to ftp.cdrom.com. And the second >one is a commercial site, so they are quite interested in letting >everybody in without troubles. Yes, but wcarchive is the largest FTP site in the world. We likely have 10 times the traffic (or more!) of those other sites. I don't think you realize just how much traffic wcarchive has each day. -DG David Greenman Core Team/Principal Architect, The FreeBSD Project
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