Fwd: [CentOS] HOW to enable traceroute with IPTABLES

Indunil Jayasooriya indunil75 at gmail.com
Sat Feb 17 08:11:03 UTC 2007


> Hi,
>
> I am setting up a firewall on CENTOS 4.4.
>
>
> I have enabled ICMP to www.google.com
>
> iptables -A OUTPUT -p icmp -d 64.233.189.104 -j ACCEPT
> iptables -A INPUT -p icmp -s 64.233.189.104 -j ACCEPT
>

traceroute uses by default UDP with port 33434.

br

Hi,

Thanks for your info.

I wrote below 2 rules

iptables -A OUTPUT -p udp -d 64.233.189.104 --dport 33434 -j ACCEPT
iptables -A INPUT -p udp -s 64.233.189.104 --sport 33434 -j ACCEPT

Then I tried as below

[root at firebox rc.d]# traceroute 64.233.189.104
traceroute to 64.233.189.104 (64.233.189.104), 30 hops max, 38 byte packets
traceroute: sendto: Operation not permitted
 1 traceroute: wrote 64.233.189.104 38 chars, ret=-1
 *traceroute: sendto: Operation not permitted
traceroute: wrote 64.233.189.104 38 chars, ret=-1
 *traceroute: sendto: Operation not permitted
traceroute: wrote 64.233.189.104 38 chars, ret=-1
 *
traceroute: sendto: Operation not permitted
 2 traceroute: wrote 64.233.189.104 38 chars, ret=-1

But Still the same.

WHY?

IF my rules are wrong can you rectify it ?

--
Marcin Mazurek

http://www.netsync.pl/  -  ::::  -  nic-hdl: MM3380-RIPE
GnuPG 6687 E661 98B0 AEE6 DA8B  7F48 AEE4 776F 5688 DC89

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-- 
Thank you
Indunil Jayasooriya
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