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Network Security Firewalls
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Re: no ping reply

Subject: Re: no ping reply
Date: Sat, 25 Feb 2006 10:19:12 +0500
here is what "show log" shows

pixfirewall(config)# show log
Syslog logging: enabled
   Facility: 20
   Timestamp logging: disabled
   Standby logging: disabled
   Console logging: disabled
   Monitor logging: disabled
   Buffer logging: disabled
   Trap logging: disabled
   History logging: disabled
   Device ID: disabled


and below is what debug icmp trace shows
pixfirewall(config)# debug icmp trace
ICMP trace on
Warning: this may cause problems on busy networks
pixfirewall(config)# 115: ICMP echo-request from inside:192.168.1.3 to 192.168.0 .9 ID=512 seq=27904 length=40
116: ICMP echo-request: translating inside:192.168.1.3/512 to outside:192.168.0. 9/0
117: ICMP echo-request from inside:192.168.1.3 to 192.168.0.9 ID=512 seq=28160 length=40
118: ICMP echo-request: translating inside:192.168.1.3/512 to outside:192.168.0.9/0
119: ICMP echo-request from inside:192.168.1.3 to 192.168.0.9 ID=512 seq=28416 length=40
120: ICMP echo-request: translating inside:192.168.1.3/512 to outside:192.168.0.9/0



currently i am pinging from a host (192.168.1.2) connect to the inside interface (192.168.1.1) of firewall to the outside interface (192.168.0.9) of firewall and no reply comes.


below is my acl

pixfirewall(config)# show access-list
access-list cached ACL log flows: total 0, denied 0 (deny-flow-max 256)
           alert-interval 300
access-list acl_out; 3 elements
access-list acl_out line 1 permit tcp any any (hitcnt=4)
access-list acl_out line 2 permit udp any any (hitcnt=70)
access-list acl_out line 3 permit icmp any any (hitcnt=4)
access-list acl_in; 3 elements
access-list acl_in line 1 permit tcp any any (hitcnt=676)
access-list acl_in line 2 permit udp any any (hitcnt=197)
access-list acl_in line 3 permit icmp any any (hitcnt=141)

pixfirewall(config)# show access-group
access-group acl_out in interface outside
access-group acl_in in interface inside

pixfirewall(config)#

and nat configs

pixfirewall(config)# show global
global (outside) 1 interface

pixfirewall(config)# show nat
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
pixfirewall(config)#



----- Original Message ----- From: "Albert Tuulas" <albert@cubio.fi>
To: "Imran Imtiaz" <imran@thelakecity.com.pk>
Cc: <firewalls@securityfocus.com>
Sent: Friday, February 24, 2006 11:28 PM
Subject: Re: no ping reply



Do you have NAT rules configured? Seems to be NAT misconfigured.

Albert

What does 'show log' and 'debug icmp trace' give when you ping inside
192.168.1.1 from 192.168.1.2?

Albert

I have cisco pix 501 firewall the ip of outside  interface is
192.168.0.9 and inside interface is 192.168.1.1. i have opened icmp
on outside and inside interfaces. Now when i ping 192.168.1.1 from a
client  having ip 192.168.1.2 no ping reply com how ever if i ping
the router attached  to the outside interface replys come. where is
the problem?



the securiting level of outside is 0 and inside is 100



regards,

imran imtiaz





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