My upstream provider must be blocking this traffic...I can't ping or trace anything off my network.
Choice one in NY Andy ----- Original Message ----- From: "R. Scott Perry" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, August 29, 2003 3:49 PM Subject: RE: [IMail Forum] OT NEWS FLASH: Adelphia views Pings as illegal > > >I specifically blocked ICMP type 8 which is the echo request, all other > >ICMP packets flow, and I tested from a Win XP box both tracert (win > >version) and ping, received the desired results (worked fine and > >destination unreachable respectively). > > It sounds like ICMP type 8 isn't being dropped. > > tracert (Windows version) uses ICMP type 8 (same as ping); the difference > is that tracert varies the TTL of each packet (so they come back before > they reach the destination. > > For ping, if the packet is dropped, you should see "Request timed > out". The "Destination unreachable" means that the ICMP type 8 packet went > out, and a "Destination unreachable" packet came back, indicating that the > packets aren't being dropped. > > >Using MTR (Matt's Traceroute) from a NetBSD box on my network packet loss > >within the LAN went from > >65-75% to 6%. > > That is very strange. I can't explain why that would happen, unless ICMP > type 8 was being dropped, but it doesn't seem to be. > > > MTR uses traceroute to determine the path, then pings > >each hop in succession to get statistics for each hop. Interesting that > >ping and traceroute are implemented with different protocols, I thought > >they only used different ICMP packet types. > > Ping and tracert (Windows version) both use ICMP type 8 packets (ping sends > a packet with a high TTL so it will reach the destination; tracert sends > increasing TTLs with each packet to see where each hop is). Traceroute > (Unix version) uses UDP packets (typically on ports over 30,000). > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers. > Declude Virus: Catches known viruses and is the leader in mailserver > vulnerability detection. > Find out what you have been missing: Ask for a free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
