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Full Discussion: Mutiple nics on Freebsd 7.0
Special Forums IP Networking Mutiple nics on Freebsd 7.0 Post 302271964 by otheus on Monday 29th of December 2008 07:11:31 AM
Old 12-29-2008
Yeah, pretty basic questions. As for (1), sometimes you have dependencies that require an outside connection for things to work right, such as DNS lookups. For instance, your other servers might have DNS-addressable IP addresses and for your computer to boot, you need a service from one of those servers. Therefore, you either hardcode the IP/host entry in /etc/hosts, OR you set the NIC to boot up with the external interface fully configured. Other than that, which NIC is "primary" really doesn't matter.

Both IPs will not appear in your router. Only the external IP will. In fact, unless you set up your file server ALSO as a router, there's no need to do any special routing. Your internal addresses will be identified because of their subnet and IP range, and all other traffic will go through the "default" route, which will be on the same subnet as your external IP address.
 

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defaultrouter(4)						   File Formats 						  defaultrouter(4)

NAME
defaultrouter - configuration file for default router(s) SYNOPSIS
/etc/defaultrouter DESCRIPTION
The /etc/defaultrouter file specifies a IPv4 host's default router(s). The format of the file is as follows: IP_address ... The /etc/defaultrouter file can contain the IP addresses or hostnames of one or more default routers, with each entry on its own line. If you use hostnames, each hostname must also be listed in the local /etc/hosts file, because no name services are running at the time that defaultrouter is read. Lines beginning with the ``#'' character are treated as comments. The default routes listed in this file replace those added by the kernel during diskless booting. An empty /etc/defaultrouter file will cause the default route added by the kernel to be deleted. Use of a default route, whether received from a DHCP server or from /etc/defaultrouter, prevents a machine from acting as an IPv4 router. You can use routeadm(1M) to override this behavior. FILES
/etc/defaultrouter Configuration file containing the hostnames or IP addresses of one or more default routers. SEE ALSO
in.rdisc(1M), in.routed(1M), routeadm(1M), hosts(4) SunOS 5.10 17 Aug 2004 defaultrouter(4)
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