Easy VPN question

Posted on 2006-04-02
Medium Priority
Last Modified: 2013-11-29
If I am trying to connect via VPN.
From my home computer I should be able the ping the public IP address of my office right?
Question by:paulmmalone
LVL 10

Accepted Solution

naveedb earned 500 total points
ID: 16356075
Depends on the router / firewall configuration. If ICMP Echo is enabled, you should, else it will request timeout. VPN does not require to have ICMP Echo enabled in order to work.
LVL 10

Expert Comment

ID: 16357185
Just to add to vaveedb,
Most firewalls will have access to "ping" returned packets turned off.  This is to stop icmp attacks (consuming firewalls processing to force them to slow down and fail).

If you would like to enable this on your Office firewall (PIX 501) I believe...you have to issue these commands.
(config)#icmp permit any any (applied to an interface for all icmp)
(config)#icmp permit any outside (this is all the traffic on the interface allowing icmp messages.)

To restict only return packets when ping from home.
(config)#access-list outside->in permit icmp any host xxxxxxxxxxxxxx echo-reply
add this traffic to your access-list for traffic  coming in...

If you are using the Cisco client.....turn on the log and see what is happening.  This can be verbose if you want....

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