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Old 04-30-2008, 01:29 AM   #1
Registered: Sep 2007
Location: Bangalore,India
Distribution: Fedora,Mandriva,Debian
Posts: 180

Rep: Reputation: 30
Thumbs up Traceroute command in Linux system

Hi All,

I am facing a problem while using a NAS Embedded device.
While running "traceroute ipaddress" command, i m getting output as:
1) * * * * Which is not desirable output as per the command description.
I have asked some of networking guys but they told me to disable the firewall for that by using following commands:
a> iptables -f
b) ip6tables -f
c) ipchains -f

The busybox which i am using is not having the source codes for ipchains ,iptables and ip6tables.So i am not able to disable the firewall.

I am stuck up here.
What could be the issue?
Please support me for that.

Ravi Chobey
Old 04-30-2008, 10:25 PM   #2
Registered: Nov 2006
Location: Seattle, WA
Distribution: Fedora
Posts: 407

Rep: Reputation: 35
The program traceroute runs in two modes (ICMP and UDP), by default, it uses UDP. If your NAS only responds to ICMP echo request, you need the -I flag for traceroute.

The * indicates that no reply was received. As your network guys said, a firewall is a likely culprit keeping either the requests from departing, or the replies from coming back. You can at least examine the rules that your firewall is using, I hope, and can perhaps find out whether ICMP messages are passed by the firewall or not.

By default, traceroute chooses which interface to send its packets out by consulting the routing table; this should be correct in nearly all cases. It seems to me that your NAS should be on the same side of the firewall that you are; if not, you should look at the rules determining what packets are allowed between the interface that your computer is attached to and the one the NAS is attached to.



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