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Community Member

Ping and traceroute


My core router 3845 connected to my remote site with E1 links and connected to my internal network with its sub-interfaces. The following is the sub-interfaces configuration.

interface GigabitEthernet0/1.1

description *********LAN IPS**********

encapsulation dot1Q 1 native

ip address


interface GigabitEthernet0/1.400

description **********ISP LIVE ROUTEABLE IPS*************

encapsulation dot1Q 400

ip address A.B.C.D

when i ping my internal ip from remote site its OK but when i tracert from remote site the packets drops at my core router. There is FTP on inside my network, my remote sites ping its ip but never FTP to that server


Hall of Fame Super Silver

Re: Ping and traceroute

Hello Waseem,

a) traceroute issue

verify with

sh ip int serial (E1 interface)

the settings of ip unreachables

if you have

no ip unreachables under interface serial x/y:15

this can cause this issue

b) is the FTP in a DMZ with a firewall or ACL rules, is the FTP server accessible also from internet ?

you need to verify if remote sites are seen as "outside" from the device that protects the DMZ

Hope to help


Community Member

Re: Ping and traceroute

hi Giuseppe, thanks for your immediate reply,

i have seen the serial interface there is " ICMP unreachables are always sent" i can ping my machine from remote router but i cann't do traceroute. Packets drops at the core router. My machine also pings the remote machine and my machine also show the output of traceroute.


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