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New Member

Not sending a default route w/ PIX 7.X

I have a PC that has 2 NICs in it its connectected to a 10.x.x.x/24 and a 192.168.x.x.

The 10.x.x.x is grabbed via DCHP from the PIX the 192.168.x.x is statically nailed w/ a default route and I want my 192.168.x.x to be the default route.

However when the machine gets the DHCP 10.x.x.x address from the PIX it has a default route incuded as well and the machine (Windows 2000) get very confused.

What I want is the ability to have the PIX not advertize a default gateway in DHCP as this interface on the PIX is a stub network and I dont want it routing anywhere off network. That interface simply does a bunch of static NATing for me.

Anyone have an Idea how I can do this?




Re: Not sending a default route w/ PIX 7.X

you could try adding the below command even though I think it is supported on transparent mode only.

dhcpd option 3 ip gateway_ip

I hope it helps .. please rate it if it does !!!

Re: Not sending a default route w/ PIX 7.X

My only idea would be that maybe you could turn off that dhcpd option on the PIX:

no dhcpd option ...

code for gateway is 3, I think.

Not sure whether this will work.

New Member

Re: Not sending a default route w/ PIX 7.X

that does work

New Member

Re: Not sending a default route w/ PIX 7.X

advanced DHCP options

code for gateway is 3,

it worked for me


Re: Not sending a default route w/ PIX 7.X


You can find the DHCPD options in RFC 2132:

It is option 3 for the 'router option'

The one thing the documentation at cisco is not clear on is whether doing a 'no dhcpd option 3' will actually work - it doesn't show up in the running config - the no command probably only clears the line if it's set in the configuration, I don't think it will turn off sending of a default route.

You may have to do a workaround - actually specify the to be the default route that the pix gives when it replies to the dhcp request - try

dhcpd option 3 ip

And that should resolve your issue, assuming that the 'no dhcpd option 3' doesn't work.


Please rate if this message helped resolve your issue.