Date: Wed, 19 Mar 2003 07:47:07 -0500 From: Bill Moran <wmoran@potentialtech.com> To: ai1@mtaonline.net Cc: freebsd-questions <questions@freebsd.org> Subject: Re: where packets are dropped in route Message-ID: <3E7866CB.5060104@potentialtech.com> In-Reply-To: <200303191011.h2JABJ0B038650@en26.ai1.anchorage.mtaonline.net> References: <200303191011.h2JABJ0B038650@en26.ai1.anchorage.mtaonline.net>
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ai1@mtaonline.net wrote: > is there any way to determine which machine along > a route is dropping packets destined for a specific > IP/port combination? > > i can't SSH to my gateway from machines elsewhere > on the internet, but i can ssh to it on a local net. > > i can ssh to other machines elsewhere on the internet > from the local gateway / local net. > > i have no firewall rules blocking any traffic. > i have the same configuration that i used with > a previous ISP - where all worked fine > (except for ppp login mods). > > my current ISP claims not to be blocking any traffic. > i think he is wrong, and would like to identify > exactly what machine is dropping the packets > destined for port 22 on my gateway. traceroute will allow you to specify a port/proto instead of using ICMP. Other tools might be helpful as well. Use nmap (in ports) to see if packets are being denied or simply dropped. You could use traceroute in combination with nmap and simply test each host along the path. Check sockstat on the ssh server and make sure it's acutally binding to the proper IP as well. -- Bill Moran Potential Technologies http://www.potentialtech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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