--Signature=_Thu__5_Feb_2004_15_18_18_-0700_MJVP7Zo+30y.CDUX Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: 7bit On Thu, 5 Feb 2004 14:09:52 -0800 (PST) "Jeremy C. Reed" wrote: |> On Thu, 5 Feb 2004, Michael Havens wrote: |> |> > Why could I ping things with out the www but not with the www? |> |> Different IP addresses. |> |> Some systems allow pings to work. And some don't. |> |> > added the www and it wouldn't ping. I then pulled up the page with the |> > www and there it was. So then what.... was there a redirection from the |> > one w/o the www to the one with? |> |> A webpage is using TCP (port 80). The ping is using ICMP. The protocols |> are different. Many admins setup firewalls for ICMP echos (request and/or |> response). |> |> What is the unix trace route command? |> |> An IP packet has a time-to--live counter. It decreases by one each time it |> is routed. So when an IP packet goes from router to router, it decreases. |> |> traceroute sets it to one. |> |> Then attempts to do three UDP port 33434 probes of the destination. But |> since the TTL is at one, the router doesn't route it and just responds |> saying that the time has exceeded. Then traceroute prints the name of the |> host, the TTL used and how much time it took for each probe. |> |> Then traceroute tries with the TTL set to two. And so on (repeat previous |> paragraph). |> have you ever used nmap ... its got alotta features and you can check if ports are open closed filtered... whatever you want... -- jason pearl ++++++++++++++++++ "Keep your friends close and your enemies closer"-Tupac ++++++++++++++++++ Kurrupted Visionz Phx, AZ registered linux user #307811 RHEL WS 3.0 Linux Machine# 193475, 227341 AMD64 Opteron 1.6 ASUS SK8N http://counter.li.org uptime 15:16:50 up 2:11, 3 users, load average: 0.15, 0.16, 0.10 --Signature=_Thu__5_Feb_2004_15_18_18_-0700_MJVP7Zo+30y.CDUX Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFAIsEqPFVsjEfVJfsRAmjHAJ94OkkijPmzdlf1Cj1/bu7GkjzbAgCfegeA B8ou+1FaFiDpQ3OEtve+50s= =+VSb -----END PGP SIGNATURE----- --Signature=_Thu__5_Feb_2004_15_18_18_-0700_MJVP7Zo+30y.CDUX--