Date: Mon, 7 Dec 1998 16:36:06 +0200 From: Ruslan Ermilov <ru@ucb.crimea.ua> To: Thomas David Rivers <rivers@dignus.com> Cc: marcs@znep.com, nate@mt.sri.com, dillon@apollo.backplane.com, eischen@vigrid.com, hackers@FreeBSD.ORG, luigi@labinfo.iet.unipi.it Subject: Re: TCP bug Message-ID: <19981207163606.A7575@ucb.crimea.ua> In-Reply-To: <199812071401.JAA26369@lakes.dignus.com>; from Thomas David Rivers on Mon, Dec 07, 1998 at 09:01:45AM -0500 References: <Pine.BSF.4.05.9812021232280.463-100000@alive.znep.com> <199812071401.JAA26369@lakes.dignus.com>
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On Mon, Dec 07, 1998 at 09:01:45AM -0500, Thomas David Rivers wrote: > Ok - > > As I understood this discussion (which seemed clear to me); the > problem was that an internal node (behind the firewall) couldn't > get to some web sites because of fragmentation issues. The low > MTU at the firewall/gateway broke path MTU discovery.. No, the problem is not with low MTU, but because AOL is blocking ICMP: PING aol.com (152.163.210.29): 56 data bytes 36 bytes from www2-r10-P5-0-0.tpopr-rri.aol.com (152.163.133.6): Communication prohibited by filter Vr HL TOS Len ID Flg off TTL Pro cks Src Dst 4 5 00 5400 68cb 0 0000 ea 01 894d 194.93.177.113 152.163.210.29 ^C --- aol.com ping statistics --- 22 packets transmitted, 0 packets received, 100% packet loss > > So - a possible work-around to the problem should be to set the > SL/IP MTU at 1500 at the gateway - right? Does your router run FreeBSD? If yes, how did you change MTU on SLIP? -- Ruslan Ermilov Sysadmin and DBA of the ru@ucb.crimea.ua United Commercial Bank +380.652.247.647 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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