From owner-freebsd-questions Tue Apr 20 13:10:28 1999 Delivered-To: freebsd-questions@freebsd.org Received: from resnet.uoregon.edu (resnet.uoregon.edu [128.223.144.32]) by hub.freebsd.org (Postfix) with ESMTP id 0B3731506D for ; Tue, 20 Apr 1999 13:10:20 -0700 (PDT) (envelope-from dwhite@resnet.uoregon.edu) Received: from localhost (dwhite@localhost) by resnet.uoregon.edu (8.8.8/8.8.8) with ESMTP id NAA09872; Tue, 20 Apr 1999 13:07:41 -0700 (PDT) (envelope-from dwhite@resnet.uoregon.edu) Date: Tue, 20 Apr 1999 13:07:40 -0700 (PDT) From: Doug White To: Stanley.Hopcroft@ipaustralia.gov.au Cc: freebsd-questions@FreeBSD.ORG Subject: Re: NATD and packet fragmentation: fragements are not re-assembled or delivered ? In-Reply-To: <4A256756.00078FAC.00@noteshub01.aipo.gov.au> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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