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ip default gateway command

Posted on 2004-08-15
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Last Modified: 2010-04-17
When would you use the "ip default-gateway" command in a cisco router?  

Do you only use the "ip default-gateway" command it when ip routing is disabled?

Which is better. Having IP routing enabled or defining a default gateway?

How does this differ from gateway of last resort?

Thanks
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Question by:dissolved
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Accepted Solution

by:
scampgb earned 200 total points
ID: 11804739
Hi dissolved,

The "ip default-gateway" command is used to specify the gateway of last resort.
It's the equivalent of specifying a route to 0.0.0.0

As for the difference between default-gateway and turning off IP routing, they aren't related.

If you turn off IP routing, it does exactly that - and essentially defeats the point of having a router :-)

Does that help?
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Author Comment

by:dissolved
ID: 11804760
thanks man
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LVL 15

Expert Comment

by:scampgb
ID: 11805593
Hi Disolved.

Thanks for the "A" :-)
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Expert Comment

by:tut404
ID: 15094903

I had a cisco soho router, which NAT with my Office internal LAN behind.

on this router, i had placed a command
ip 0.0.0.0 0.0.0.0  <isp_wan_ip>

this will also internet traffic to comes into and go out via my router.

I just order a new sets of 14 LAN ip address, which I will need to conffig  for my LAN


Internet
 |
 |
ATM0 :  210.210.100.82 / 30
cisco router
Ethernet0 : 64.64.100.145 / 28
 |
 |
interface : 64.64.100.146 / 28
Firewall
interface : 192.168.20.1 / 24


The firewall of course will do an NAT for 192.168.20.1 .

But what sort of  ip route i need to put in my cisco router?
or do i need need to use ip default-gateway  command ?
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