[Asterisk-Users] Re: How is Teliax ?

[asterisk at anime.net]

On Mon, 3 Apr 2006, Kristian Kielhofner wrote:
> asterisk at anime.net wrote:
>> On Sun, 2 Apr 2006, Rich Adamson wrote:
>>>>> end-to-end path. Each step through the tracert process does nothing more 
>>>>> then issue an icmp echo request, measuring the response time and 
>>>>> displaying it.
>>>> maybe on windows it does icmp echo but no unix does this (at least not by 
>>>> default). i recommend you study what unix traceroute actually does. :)
>>> I'm very heavy (professionally) into protocol analysis, and yes unix does 
>>> rely on icmp to perform the traceroute. (icmp pkt type 11, code 0)
>>> If you're a non-believer, put an access list on all icmp traffic and see 
>>> if your traceroute continues to function. :)
>> I said unix doesn't rely on icmp echo (might want to actually read the 
>> message next time :)
>> 
>> I can block icmp echo and unix traceroute will function perfectly fine.
> Dan,
> 	Not that I want to get into this thread, but traceroute uses a 
> mixture of UDP and ICMP.  It uses UDP for the initial packets and then 
> listens for ICMP responses from each gateway.

I know that. What i've been saying all along (and what everyone seems to 
be (deliberately?)) omitting is that unix traceroute does not use icmp 
echo.

-Dan