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Posted by Trendkill on June 3, 2008, 7:16 am
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> > So I have a strange issue with my 1841. I'm using it in a very simple
> > scenario (home router on DSL line).
>
> > For some reason the router of last resort only gets set if I set
> > FastEthernet0/1 address via dhcp. If I set it statically and then set
> > router of last resort it doesn't show in show run config.
>
> > Anyone seen something like this? Is it a known bug in a slightly
> > outdated version of IOS?
>
> > ROM: System Bootstrap, Version 12.3(8r)T6, RELEASE SOFTWARE (fc1)
>
> > I haven't read through all of the release notes for later versions of
> > IOS. Is that where I should look to see bug notices or is there some
> > place else I should check for that?
>
> If you set the Fa0/1 address manually are you also setting a default
> route? If not then there won't be one. A DHCP server will usually
> provide a default gateway as well as an IP address (as well a whole
> bunch of other stuff).
>
> Sam
Sam is right on point, if you are not running a routing protocol with
the provider (which is never done on Residential service), then you
router is getting its default gateway from the DHCP process. DHCP can
provide many extra fields beyond an IP and Subnet Mask, such as DNS
servers, default gateways, and tftp servers. As soon as you set a
static, you must provide these variables on your own to each node on
that same subnetwork (in this case, probably only your router, and DNS/
TFTP are probably not needed).
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