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Routing Issue

Hello All:

I'm having an issue with my ISP and it looks to me like a routing issue their end. They assinged me a "static" ip which is really a 20 year DHCP leased IP.

Connected directly to their modem with my laptop I can pull the following configuration from their DHCP server

IP -

GW -

Subnet -

Can get out no problem. When I transfer these IP's to my Sonicwall (nat enabled). I cannot get out.

Looking out the routing tables on the firewall itself I see 2 discovered routes. 1 for my internal

and one for ISP. The internal is good, anything destined for network, use GW

However, the route for ISP reads anything destined for, use GW

I cannot understand why it's seing my static IP as the gateway? this would explain why when moving to the Firewall with this config, it can't get out. Is this a correct assumption. Wrong Gateway is what I see and why is the route looking for .128

Any insights would be appreciated.

Cisco Employee

Re: Routing Issue

It is normal for the FW to have an entry for to This just say that to reaqch any destination on that /27 use the directly connected subnet. Do have a default route pounting at ? That seems to be what the problem is.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600

Re: Routing Issue

Indeed -- it looks like the firewall isn't using the default route provided by DHCP. Hopefully this is configurable, otherwise you'll need to statically define a default gateway.