Security Basics mailing list archives
Re: traceroute-like tool for UDP or TCP packet
From: Edward Rustin <ed () well com>
Date: Thu, 21 Aug 2003 09:36:34 -0700 (PDT)
On Thu, 21 Aug 2003, some guy wrote:
Linux uses UDP packets to traceroute, not ICMP packets like windows does. Hope that helps, -Scott
Not really.... an ICMP packet is a type of UDP packet. Basicly traceroute works by sending a series of ICMP ECHO requests with increacing TTLs (time to live - how many hops the packet can travel before it dies and aPacket Timeout error is sent). A ping is also just a ICMP ECHO message, just with a defualt TTL, rather than a series of increasing TTLs.
From: "Kent James" <kent1 () caspia com> To: <security-basics () securityfocus com> Subject: traceroute-like tool for UDP or TCP packets Date: Wed, 20 Aug 2003 22:30:21 +0500 One of the local ISPs is having trouble getting DNS information from Easydns. I suspect they have a misconfigured firewall or other security block in their system. I can ping and traceroute the DNS servers but get no response from UDP or TCP packets. Is there a tool that works like traceroute, only shows the route for TCP or UDP packets instead of the ICMP packets that traceroute uses?
Make sure that the IS isn't blocking traffic coming back from a port 53, or too a port 53 (make sure both UDP and TCP is open since a large DNS relpy (over 1500 bytes I =think=) will get replied to oever TCP Edward Rustin Directory of Security, OnlineGuardians.org --------------------------------------------------------------------------- ----------------------------------------------------------------------------
Current thread:
- Re: traceroute-like tool for UDP or TCP packets some guy (Aug 21)
- Re: traceroute-like tool for UDP or TCP packet Edward Rustin (Aug 21)
- Re: traceroute-like tool for UDP or TCP packet Ranjeet Shetye (Aug 21)
- Re: traceroute-like tool for UDP or TCP packet Ranjeet Shetye (Aug 21)
- RE: traceroute-like tool for UDP or TCP packet David Gillett (Aug 21)
- Re: traceroute-like tool for UDP or TCP packet Ranjeet Shetye (Aug 21)
- <Possible follow-ups>
- Re: traceroute-like tool for UDP or TCP packets A.C. Speelman (Aug 21)
- Re: traceroute-like tool for UDP or TCP packet Edward Rustin (Aug 21)