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Re: [LUG] Oddity...

 

On Thu, Mar 15, 2007 at 07:51:26AM +0000, Tom Potts wrote:
> On Thursday 15 March 2007 07:28, Neil Stone wrote:
> > Is someone able to shed light on why I am able to ping a specific host,
> > but not traceroute to it ?
> >
> > I get 6 hops along the route and then it gives up..
> Not 100% sure but traceroute uses ICMP which can be used to discover lots and 
> lots about a network - so it would be sensible to 'disallow' it where thats 
> not needed so traceroute will stop there

Try tcptraceroute instead?

alan@colossus:~$ apt-cache search tcptraceroute
tcptraceroute - A traceroute implementation using TCP packets


alan@colossus:~$ tcptraceroute bishop.popey.com 25
Selected device eth0, address 192.168.129.4, port 48709 for outgoing packets
Tracing the path to bishop.popey.com (212.13.194.80) on TCP port 25 (smtp), 
30 hops max
 1  192.168.129.11  0.470 ms  0.316 ms  0.312 ms
 2  10.129.96.1  7.978 ms  10.634 ms  7.005 ms
 3  glfd-t2cam1-a-v103.inet.ntl.com (80.4.30.13)  8.536 ms  12.326 ms  8.159 
ms
 4  glfd-t2core-a-ge-wan61.inet.ntl.com (195.182.175.241)  7.614 ms  11.591 
ms  9.535 ms
 5  gfd-bb-a-so-730-0.inet.ntl.com (213.105.174.153)  8.797 ms  8.069 ms  
7.292 ms
 6  pop-bb-b-so-010-0.inet.ntl.com (213.105.172.138)  9.931 ms  9.345 ms  
9.647 ms
 7  tele-ic-2-as0-0.inet.ntl.com (62.253.184.6)  9.843 ms  9.655 ms  10.119 
ms
 8  ldn-s2-rou-1002.uk.eurorings.net (195.66.224.54)  20.843 ms  20.321 ms  
19.748 ms
 9  ldn-s2-rou-1022.uk.eurorings.net (134.222.231.225)  21.908 ms  20.352 ms  
28.559 ms
10  134.222.230.122  21.777 ms  21.177 ms  23.723 ms
11  ldn-s2-rou-1002.uk.eurorings.net (134.222.231.62)  21.436 ms  19.892 ms  
19.783 ms
12  kpn-gw-sup-tfm1.jump.net.uk (194.153.169.236)  11.858 ms  11.376 ms  
11.532 ms
13  bishop.popey.com (212.13.194.80) [open]  12.679 ms  11.895 ms  13.005 ms


Cheers,
Al.

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