VPN tunnel with only one authorized service

Hello

has got a pix 520 with V 6.22. Now, I created a VPN Tunnel from our server to a

annother company server and I only want to have ssh connection. If it works

pretty good - but the other host, it is possible to connect on our host by

ICMP, ftp, telnet... How can I manage configured my pix to refuse all this

services?

Here is my configuration:

name 10.x.x.x ffmz1_is

name 212.x.x.x conliner_os

conliner_ssh name 192.168.0.250

object-group network conliner

object-network 192.168.0.0 255.255.255.0

access list on the inside to allow icmp host ffmz1_is a

access-list inside permit TCP host ffmz1_is any ftp eq

access-list inside allow host ffmz1_is udp any eq smtp

access-list inside allow host ffmz1_is host conliner_ssh eq ssh tcp

no_nat list of allowed access host ip conliner object-group ffmz1_is

access-list allowed conliner host ip conliner object-group ffmz1_is

...

crypto VPN 30 card matches the address conliner

card crypto VPN 30 set peer conliner_os

...

Thank you very much

The sole purpose of "ipsec sysopt connection permit" is to allow traffic through a tunnel to bypass access-groups. It is not necessary to use it, but then you must explicitly allow traffic you want through your access list.

The command is very useful when you need to establish a vpn using the cisco customer remotely. Because you must use dynamic crypto maps and you don't know the IP address of the peer, if you didn't have the sysopt command, you will need to allow traffic from an source.

And you don't have to open all ports for the PIX to be able to establish the tunnel with its ipsec peer.

You need to allow udp 500 and protocol 50-51 when ipsec traffic through your firewall. Let's say you have another PIX inside who wants to establish a vpn on your main PIX with a third PIX on the outside, you must open the ports in your main PIX.

Tags: Cisco Security

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