Using "/etc/rc.d/netif start"

[Jason Helfman]

On Tue, Mar 29, 2011 at 10:40:19AM -0700, Nerius Landys thus spake:
>First off, I'm on 9.0-CURRENT-i386, but I don't think that will make a
>difference for purposes of my question.  I think the freebsd-current
>folks are expecting questions that are much harder than this one.
>
>I'm trying to use /etc/rc.d/netif to bring down and bring back up all
>network interfaces, because I'm trying to get the correct entries in
>/etc/rc.conf for testing some extra network cards.
>
>So right now, my /etc/rc.conf looks like this:
>
>defaultrouter="192.168.0.254"
>hostname="elmer.i"
>ifconfig_em0="inet 192.168.0.6 netmask 255.255.255.0"
>
>/etc/resolv.conf looks like this:
>
>domain  i
>nameserver      192.168.0.254
>
>I'm basically in a LAN.  When I boot up this "elmer.i" machine,
>everything works well.
>
>Then, I do the following two commands:
>
>  /etc/rc.d/netif stop
>  /etc/rc.d/netif start
>
>After these, I'm still able to ping a raw IP LAN address such as
>192.168.0.254.  However, two problems start occurring:
>
>1. I cannot ping an IP address that is outside of my LAN, e.g.
>> ping 64.156.192.169
>PING 64.156.192.169 (64.156.192.169): 56 data bytes
>ping: sendto: No route to host
>
>2. DNS (via 192.168.0.254 nameserver) won't work at first, but starts
>to magically work when I for example enable sshd and log in to elmer
>from another host on the LAN
>
>
>So the nut of my question is, I think "/etc/rc.d/netif stop" stops
>some additional things such as packet routing that the corresponding
>"/etc/rc.d/netif start" command won't start back up.  So what is the
>best way to bring down the network and bring it back up again for
>purposes of testing /etc/rc.conf syntax?

In my experience, I've found it best to restart 'routing,' as well.

/etc/rc.d/routing restart

-jgh

-- 
Jason Helfman
System Administrator
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