Routing problem -can I believe the ISP tech?
On Sat, Nov 02, 2002 at 05:11:31PM -0500, Richard Goodman wrote: If you're going to send email in html, at least be kind enough to send in in plain text too. -- Frank Sweetser fs at wpi.edu, fs at suave.net | $ x 18 Full-time WPI Network Engineer, Part time Linux/Perl guy | Wow, I'm being shot at from both sides. That means I *must* be right. :-) -- Larry Wall in <199710211959.MAA18990@wall.org>
From my office workstation I can also ssh to EFO and access EFO website (which in fact I uploaded to the new server from my office today). Does
HTML problem. Who can't read your email? On Sat, Nov 02, 2002 at 05:11:31PM -0500, Richard Goodman wrote: <html> <pre> I just brought up my fourth RH7.3 server Friday afternoon (one of two RH7.0 servers that had been hacked-new hard drive and software). I then went home and spent a couple of hours connected to it with ssh on a workstation connected to my home RH7.3 server.<br> <br> When I went to rerun a slightly modified (open ports for ftp and internal dhcp twiddling) ipchains firewall I lost the connection, and, more than 16 hours later, don't have it back.<br> <br> Other relevant details. (let's call the servers Home and EFO)<br> <br> Home was the other hacked server, and was formatted and rebuilt last weekend.<br> <br> Home and EFO are on the same ISP and each has a block of 4 static IPs. The blocks share the first 18 bits of their IP#s.<br> <br> Home could connect to EFO last night <br> <br> Home now cannot connect to EFO via ssh, or access its web site. Pings are disabled on all my servers - so I can't do that test.<br> <br> EFO network workstations can browse the web; I can ping out from the EFO linux box or workstations, and can ping EFO's Cisco 678 router from its Linux box<br> <br> EFO workstations cannot access Home websites (but I had not tried this before since rebuilding EFO Linux box<br> <br> Home Cisco 678 cannot be pinged from Home Linux box (!) or EFO (Linux or workstation), but can be pinged from my office (Linux box on other ISP). this discount the possibility of a firewall issue?<br> <br> I spent countless hours talking to the ISP (Qwest) tech support, and over an hour with a senior tech who had some Linux knowledge, and he claims that it must be a configuration issue on one or both of my Home and EFO Linux boxes, since:<br> <br> He can login to both my Cisco routers and ping the other router - he claims this proves its not a Qwest routing problem.<br> <br> If he's right I'm still puzzled by two things:<br> a) Why could I connect from Home to EFO for two hours last night, no problems?<br> b) Why can't the Home Linux box ping the Cisco 678 directly connected to it?<br> <br> I knew nothing about routing before today - here's the Home routing table:<br> <br> <tt>route -n<br> Kernel IP routing table<br> Destination Gateway Genmask Flags Metric Ref Use Iface<br> xxx.yyy.28.48 0.0.0.0 255.255.255.248 U 0 0 0 eth0<br> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1<br> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo<br> 0.0.0.0 xxx.yyy.28.54 0.0.0.0 UG 0 0 0 eth0<br> <br> </tt>I tried the following but still could not access EFO (added just the EFO IP#, not the network block:<br> <br> <tt>#route add -host xxx.yyy.26.57 dev eth0<br> # route -n<br> Kernel IP routing table<br> Destination Gateway Genmask Flags Metric Ref Use Iface<br> xxx.yyy.26.57 0.0.0.0 255.255.255.255 UH 0 0 0 eth0<br> xxx.yyy.28.48 0.0.0.0 255.255.255.248 U 0 0 0 eth0<br> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1<br> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo<br> 0.0.0.0 xxx.yyy.28.54 0.0.0.0 UG 0 0 0 eth0<br> <br> </tt>Is this enough if to decide if the tech is right or crazy? Any suggestions - I still can't access Home from/to EFO.<br> <br> Dick<br> </pre> </html> _______________________________________________ Wlug mailing list Wlug@mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug -- Charles R. Anderson <cra@wpi.edu> / http://angus.ind.wpi.edu/~cra/ PGP Key ID: 49BB5886 Fingerprint: EBA3 A106 7C93 FA07 8E15 3AC2 C367 A0F9 49BB 5886
participants (3)
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Charles R. Anderson -
Frank Sweetser -
Richard Goodman