Cisco FirePOWER SFR Module Cannot Ping

KB ID 0001174 Dtd 10/04/16


On a newly deployed FirePOWER service module I wanted to test connectivity and attempted to ping a public IP address. This is what happened;

> expert
admin@Petes-SFR:~$ ping
ping: icmp open socket: Operation not permitted

My first though was, “Well you have to set a default gateway on the SFR when you set it up, so the firewall is probably blocking ICMP”. So I checked the default policy and indeed there was no ICMP inspection turned on.

ASA default inspection map

UPDATE: The correct way to do this, (as pointed out below) is the use;

system support ping {IP or Hostname}

-=-=-=- Back to the original post -=-=-=-

On checking the Firewall, (Note: The decrement-ttl-tcl isn’t really needed, I do that to make tracerts work).

Petes-FW(config)# policy-map global_policy
Petes-FW(config-pmap)# class inspection_default
Petes-FW(config-pmap-c)# inspect icmp
Petes-FW(config-pmap-c)# class class-default
Petes-FW(config-pmap-c)# set connection decrement-ttl
Petes-FW(config-pmap-c)# exit
Petes-FW(config-pmap)# exit
Petes-FW(config)# write mem
Building configuration...
Cryptochecksum: ae83c992 52a79538 b8370d6f 36125070

3120 bytes copied in 0.290 secs

Unfortunately it still didn’t work!



Some forum searching yielded the same error on other flavours of Linux, the fix there was to change some permissions, so I gave that a try, and it worked.

admin@Petes-SFR:~$ sudo chmod u+s /bin/ping

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

admin@Petes-SFR:~$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=52 time=12.8 ms
64 bytes from icmp_req=2 ttl=52 time=13.7 ms
64 bytes from icmp_req=3 ttl=52 time=12.6 ms
64 bytes from icmp_req=4 ttl=52 time=13.2 ms


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Author: PeteLong

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  1. Hi there.
    Actually you can ping also directly from CLISH mode ‘system support ping x.x.x.x’. This tip has been given by the cisco support team 🙂
    Thnak you for your messages though, they have been of great help for my starting connfiguration of the SFR Module !

    Post a Reply
  2. Awesome!! Thanks alot.

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