[63201] in North American Network Operators' Group
Re: ICMP Blocking Woes
daemon@ATHENA.MIT.EDU (Eric Kagan)
Tue Sep 30 07:06:07 2003
From: "Eric Kagan" <ekagan@axsne.com>
To: <nanog@merit.edu>
Date: Tue, 30 Sep 2003 07:04:52 -0400
Errors-To: owner-nanog-outgoing@merit.edu
> WindowsNT tracert.exe uses 92 byte icmp packets. There is a modified
version
> that uses a smaller sized icmp packet at
> http://www.nthelp.com/NT6/tracert_broken.htm that works fine on Windows
> 2000.
So if tracert1 doesn't work, would that mean Comcast is actually blocking
all ICMP ? I have been told they are only blocking 135-139, 4444
I get the same results with tracert and tracert1 (below)
D:\Temp>ver
Microsoft Windows 2000 [Version 5.00.2195]
D:\Temp>tracert1 www.advil.com
Tracing route to www.advil.com [164.109.5.98] over a maximum of 30 hops:
1 20 ms 10 ms 10 ms c-24-218-168-1.ne.client2.attbi.com
[24.218.168.1]
2 20 ms 10 ms 10 ms 24.62.0.245
3 * * * Request timed out.
4 * * * Request timed out.
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
D:\Temp>tracert www.advil.com
Tracing route to www.advil.com [164.109.5.98] over a maximum of 30 hops:
1 20 ms 10 ms 10 ms c-24-218-168-1.ne.client2.attbi.com
[24.218.168.1]
2 10 ms 10 ms 20 ms 24.62.0.245
3 * * * Request timed out.
4 * * * Request timed out.
5 * * * Request timed out.
6 * ^C
Eric
