Cannot ping public ip from internal

Giganews Newsgroups
Subject: Cannot ping public ip from internal
Posted by:  Eddie (h…
Date: 2 Dec 2003

Hello Tech support,

Network are as follows :
system B -------|
system A -----catalyst switch 6500 -------PIX 5** ------Cisco router
2600 -T1--                      

System A ip :  (static mapped to

System B ip :

Catalyst 6500  ip :

Pix 5** inside ip :
Pix 5** outside ip :

Cisco router 2600 ip :

We use static cmd in Pix to map the internal ip of system A
( to an public IP (, so, we can connect this
system from outside the internet. Acturally, it is a web server and
user in remote site can get into the web serve by through
internet no problem.

Problem :
System B can only connect to system A by but not

System B cannot even ping system A by

Telnet to Pix and cannot ping from the pix. Pinging to is fine.Pinging to is fine.

Telnet to Route 2600, pinging to is fine.

Only one Vlan is use and system A and system B are in that vlan.

System A can ping any public ip in internet an any private ip in the

Pix is running os ver 5.2(4).

Do a tracert from system B to, it only show the first hop
to (the MFSC in catalyst 6500) and the rest is just *.

We need to be able to access system A from system B by the public IP.
Have any ideas ?

Best Regards