Date: Fri, 18 Feb 2005 23:45:57 -0800 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: <dgw@liwest.at>, "Jan Grant" <Jan.Grant@bristol.ac.uk> Cc: questions@freebsd.org Subject: RE: How do I set the source address on a multi-homed host? Message-ID: <LOBBIFDAGNMAMLGJJCKNKEHHFAAA.tedm@toybox.placo.com> In-Reply-To: <200502152129.31091.dgw@liwest.at>
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> -----Original Message----- > From: owner-freebsd-questions@freebsd.org > [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Daniela > Sent: Tuesday, February 15, 2005 1:30 PM > To: Jan Grant > Cc: Alin-Adrian Anton; questions@freebsd.org > Subject: Re: How do I set the source address on a multi-homed host? > > > > > > Having said that: technically, you specify source addresses for > > connections by calling bind(2) prior to calling connect(2). > If you fail > > to do this, the operating system will select a source IP address for > > you. This'll often be the IP of the outgoing interface. > > Well, if the OS selects the source IP, can't I just modify the > code that > selects it? Will this work all the time, or just when the > application lets > the OS select an address for it? > Daniela, I have a FreeBSD 4 system setup as a NAT router, (it's real name is nat-rtr.freebsd-corp-net-guide.com) that has 2 interfaces, the inside is 192.168.1.1, the outside is 65.75.197.130 This is in fact a real live system and I'm using it right now. I have several FreeBSD systems on the 192.168.1 network on the inside, and several FreeBSD systems on the 65.75.197 network on the outside. If I log into nat-rtr.freebsd-corp-net-guide.com (doesen't matter what interface I connect to) and I initiate a Telnet session from nat-rtr.freebsd-corp-net-guide.com to a system on the 192.168.1 network, once I'm logged into that system, issuing a "w -n" command shows me logged in from 192.168.1.1 If on the other hand I log into a FreeBSD system that is on the 65.75.197 network, and issue a "w -n" command, then it shows me as being logged in from 65.75.197.130 If your setup isn't doing this, then it's screwed. If it IS working this way and you think there's something wrong, then it is you that are screwed. :-) Could you confirm behavior one way or another - up until now the explanations and your responses have been extremely fuzzy (open to a number of different interpretations) Ted
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