Date: Thu, 30 Oct 2008 09:19:48 +0000 From: Chris Hastie <lists@oak-wood.co.uk> To: freebsd-questions@freebsd.org Subject: Setting a different default source address Message-ID: <49097C34.3030608@oak-wood.co.uk>
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Is it possible to set a default source address on a machine? I have an ADSL connection with a fixed IP and a further /29 routed to it. Until recently I used an ADSL router which acquired the connection IP, and then the first of the /29 on the internal interface. In an effort to conserve both IPs and the number of machines I have running I have recently changed to using an ADSL modem (Vigor Draytek 110) which essentially does no more than change the PPPoA to PPPoE. A FreeBSD machine then handles the connection using ppp. The machine in question has always used one of the /29 addresses, and continues to do so (this is assigned to its DMZ facing NIC, vr0). Now, of course, outgoing packets are using the connection address, which is assigned to tun0. Whilst I can override this on an application by application basis for many things (eg postfix smtp_bind_address parameter, ping -S switch) is there any way to override it system wide, so that the address from the /29 is used by default? I think I succeeded in doing something similar for an IPv6 tunnel by not assigning an IP address to gif0 and configuring the routing as follows in rc.conf: ipv6_defaultrouter="-interface gif0" But I'm not clear whether this would work with ppp, and if so, how to do it.
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