Date: Tue, 20 Apr 1999 13:07:40 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: Stanley.Hopcroft@ipaustralia.gov.au Cc: freebsd-questions@FreeBSD.ORG Subject: Re: NATD and packet fragmentation: fragements are not re-assembled or delivered ? Message-ID: <Pine.BSF.4.03.9904201305500.1514-100000@resnet.uoregon.edu> In-Reply-To: <4A256756.00078FAC.00@noteshub01.aipo.gov.au>
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On Sat, 17 Apr 1999 Stanley.Hopcroft@ipaustralia.gov.au wrote: > Unfortunately it does *not* reliably transport the data between the mainframe > and the LAN. > > The tn3270 sessions and ftp data sessions hang intermittently. FreeBSD release version? > A tcpdump on the router shows that packets from the mainframe (which is via a > frame-relay WAN) > > . are bigger than 500 bytes > . are fragmented by some intervening router into two 1480 byte packets (probably > the FreeBSD router given the size of the fragments) > . are not acknowleged by the 199.19.99.0 end-system Is the end-system even receiving the data? .0 isn't a valid host address, by the way. Make it .2 or something non-special. > The 199.19.99.0 end-system keeps acking earlier byte-ranges, the > mainframe resends the packet (which appears as new fragements) until > the end-system resets the connection. The ACKs are getting dropped too. > When I change the LAN (and router) to an address the mainframe can > route to, and stop using natd, all is well. Hm. Try throwing some logging on a firewall rule and make sure the packets aren't getting blocked or dropped. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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