topic Re: disable Spoof detection Inside in Network Security

disable Spoof detection Inside

dmooreami — Mon, 11 Mar 2019 13:49:34 GMT

Have a pix 515e in lab running 7.0x code. It is flooding me with Ip spoof messages. how do I disable Ip spoof detection on the inside interface. The addresses it claims are being spoofed are GRE tunnel endpoints that need to pass thru the pix.

I have this config running in production and don't get any spoof messages

Thanks

Re: disable Spoof detection Inside

suschoud — Fri, 26 Sep 2008 13:33:16 GMT

Run :

sh run | in ip verify

You should see :

ip verify reverse-path interface inside

Do a " no "...

no ip verify reverse-path interface inside

If this does not help,maybe you can post the exact log message.

Regards,

Sushil

Re: disable Spoof detection Inside

dmooreami — Fri, 26 Sep 2008 14:00:30 GMT

had spoof off on the interfaces, there was no Ip verify reverse-path.

Ok here was the problem, I had static routes on the pix that pointed to subnets on the inside that were not present on my lab router.

Example, I had route to 192.168.99.7 but no 192.168.99.0/24 subnet. I created a loopback interface with that subnet and the spoofs that the pix was reporting to 99.7 went away.

Seems a guy in another thread had a similar problem but he didn't have a default route set for his outside interface

Once I went into my lab router and created loopbacks with the 3 subnets that were being spoofed, all spoof attacking ceased.