Date: Wed, 24 Jun 1998 15:22:18 +0200 From: Eivind Eklund <eivind@yes.no> To: Oleg Semyonov <os@ktpk.dp.ua>, freebsd-questions@FreeBSD.ORG Subject: Re: FreeBSD+natd = tcp connection problems Message-ID: <19980624152218.64866@follo.net> In-Reply-To: <01bd9f67$83b3f9e0$0400a8c0@admin.dnepr.com>; from Oleg Semyonov on Wed, Jun 24, 1998 at 03:59:17PM %2B0400 References: <01bd9f67$83b3f9e0$0400a8c0@admin.dnepr.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Jun 24, 1998 at 03:59:17PM +0400, Oleg Semyonov wrote: > Hi all! > > I have some problems with tcp connections to some servers > (ftp, irc and some others). My network configuration is quite > simple: FreeBSD box is connected via slip (sl0) to IP provider > (BSDI 2.1) and via NIC (de0) - to LAN (Win95/NT workstations). > I have one real IP for FreeBSD box and private network > 192.168.0.* for LAN. Natd is used for NAT, and all was ok, but... > > PROBLEM DESCRIPTION: > > When I trying to ftp to some servers from FreeBSD, in some > cases I can enter login/password, and then see only first > 230- > line, and connection hangs. When using password in form of > -user@ (disable that 230- messages) - all ok. For example, > connect to ftp.kiae.su and ftp.hp.com was failed, connect > to ftp.microsoft.com - ok. > Then I found that we are using different MTU values on > both sides of slip link (308 by defaul on BSDI, 507 by default > on FreeBSD). I'm setting my side to 308. All ok, ftp with no > problems. But only from FreeBSD box. Workstations from LAN via > natd cannot ftp with same problem: 230- and stop. Workstations > on LAN and de0 interface on FreeBSD are using MTU=1500. > Next stage was to replace slip by ppp with mtu=1500. Effect > was same: dropped connections from FreeBSD (and LAN too). Changing > ppp0 MTU to 296-308 solves problem, but for FreeBSD box only. > LAN cannot ftp to such servers. Irc connections from LAN hangs > in same manner. > > What is the reason and what can I do? Does anybody help me? This belongs in FreeBSD-questions - I've moved it there. I also believe the problem is probably your FTP clients rather than the NATD code, but I can't guarantee this. natd is somewhat dependent on how that packets are constructed, but this shouldn't matter at _that_ stage - only when you do an LS or GET. Eivind. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19980624152218.64866>