topic Re: URGENT in Network Security

URGENT

aksher — Mon, 11 Mar 2019 11:52:02 GMT

What's the conf required on FWSM to disable VPN/IPSEC traffic inspection or to allow VPN traffic explicitly?

Re: URGENT

Alan Huseyin Kayahan — Tue, 22 Jan 2008 23:30:44 GMT

Hi Aksher

no fixup protocol pptp command will disable the inspection. For allowing to specific external host from inside, you need the following ACLs

access-list inside_access_in permit gre any host externalVPNserver

access-list inside_access_in permit tcp any host externalVPNserver eq pptp

or if you like, you can specify the source and set destination as any

Keep in mind that if you dont have an existing inside_access_in, then you should specify the permitted traffic in this acl since this blocks the rest of the traffic from inside to outside.

Regards

Re: URGENT

aksher — Wed, 23 Jan 2008 00:28:20 GMT

But this is for VPDN setup know???In my case

I am using remote VPN client and no PPTP.

Re: URGENT

Alan Huseyin Kayahan — Wed, 23 Jan 2008 15:39:57 GMT

Ah, I misunderstood your question.

In your case, this is usually resolved via authorization (Like f you have a RADIUS or TACACS you can disable the specific user vpn remote access), but following can be tried.

Ipsec over UDP uses port 4500 and IPsec over TCP uses 10000. You can block these ports to specific resources like

access-list outside_access_in deny udp host x.x.x.x interface outside eq 4500

access-list outside_access_in deny tcp host x.x.x.x interface outside eq 10000

x.x.x.x is the global IP of the VPN client