[GRLUG] No connectivity between two specific end-points

[Steven Scherbinski]

On 11/13/12 9:40 AM, Adam Tauno Williams wrote:
> Quoting megadave <megadave at gmail.com>:
>> On Tue, Nov 13, 2012 at 9:19 AM, megadave <megadave at gmail.com> wrote:
>>> What does the route table on the host at  192.168.34.183 look like?
>>> What are the IP addreses of "A" and "B" ?
>>> On Tue, Nov 13, 2012 at 9:15 AM, Adam Tauno Williams
>>> <awilliam at whitemice.org> wrote:
>>>> This end: LINUX box A and LINUX box B
>>>> Mystery is that "A" can ping the remote device, and perform HTTP
>>>> connections, B cannot (no ping, no HTTP, etc...).  The remote 
>>>> device is a
>>>> very boring HP4200 laser printer
>>>> Firewall on A & B:
>>>> cassowary:~ # iptables --list
>>>> Chain INPUT (policy ACCEPT)
>>>> target     prot opt source               destination
>>>> Chain FORWARD (policy ACCEPT)
>>>> target     prot opt source               destination
>>>> Chain OUTPUT (policy ACCEPT)
>>>> target     prot opt source               destination
>>>> Remote device 192.168.34.183 which lies on the other side of an 
>>>> MPLS 'cloud'
>>>> [so oblivious to whatever hi-jinks the proprietary numb skulls in 
>>>> the middle
>>>> pull].
>>>> Traceroute from A [working]:
>>>> adam at cebolla:/home/adam> sudo /usr/sbin/traceroute 192.168.34.183
>>>> traceroute to 192.168.34.183 (192.168.34.183), 30 hops max, 40 byte 
>>>> packets
>>>> using UDP
>>>>  1  router.example.com (192.168.1.6)  0.864 ms   0.538 ms 0.585 ms
>>>>  2  172.20.42.102 (172.20.42.102)  2.175 ms   1.980 ms 2.231 ms
>>>>  3  12.84.15.221 (12.84.15.221)  7.391 ms   7.292 ms   6.843 ms
>>>>  4  cr85.cgcil.ip.att.net (12.122.85.102)  20.248 ms 19.627 ms   
>>>> 19.046 ms
>>>>  5  cr1.cgcil.ip.att.net (12.122.99.33)  22.327 ms   21.691 ms   
>>>> 21.584 ms
>>>>  6  cr82.gdrmi.ip.att.net (12.122.152.6)  18.671 ms   18.115 ms   
>>>> 19.772 ms
>>>>  7  12.112.209.37 (12.112.209.37)  12.450 ms   12.352 ms 12.230 ms
>>>>  8  12.112.209.38 (12.112.209.38)  16.428 ms   17.401 ms 17.632 ms
>>>>  9  192.168.34.183 (192.168.34.183)  15.715 ms   15.978 ms 16.346 ms
>>>> Traceroute from B [not working]:
>>>> adam at cassowary:~ # sudo /usr/sbin/traceroute 192.168.34.183
>>>> traceroute to 192.168.34.183 (192.168.34.183), 30 hops max, 40 byte 
>>>> packets
>>>> using UDP
>>>>  1  router.example.com(192.168.1.6)  0.621 ms   0.646 ms 0.695 ms
>>>>  2  172.20.42.102 (172.20.42.102)  2.290 ms   2.239 ms 2.404 ms
>>>>  3  12.84.15.221 (12.84.15.221)  7.355 ms   8.100 ms   7.851 ms
>>>>  4  cr85.cgcil.ip.att.net (12.122.85.102)  20.735 ms 20.269 ms   
>>>> 19.558 ms
>>>>  5  cr1.cgcil.ip.att.net (12.122.99.33)  22.579 ms   22.115 ms   
>>>> 20.127 ms
>>>>  6  cr82.gdrmi.ip.att.net (12.122.152.6)  18.181 ms   18.653 ms   
>>>> 18.080 ms
>>>>  7  12.112.209.37 (12.112.209.37)  13.358 ms   12.310 ms 12.216 ms
>>>>  8  12.112.209.38 (12.112.209.38)  16.149 ms   16.217 ms 16.486 ms
>>>>  9  * * *
>>>> Hmmmm.  Host B can reach and communicate with every other host on 
>>>> the remote
>>>> subnet.  The remote router [12.112.209.38] is a Cisco 2800 that 
>>>> doesn't do
>>>> any packet filtering [only QoS].
>>>> Guesses / thoughts as to what might be eating the packets for this 
>>>> very
>>>> specific pair of end-points?
>> Also, waht kind of device is, and what does the route table on
>> 192.168.1.6 look like?
>
> No clue, it is "a very boring HP4200 laser printer",  all it has is a 
> default gateway, which is the IP address of the remote site's router 
> [verified that, it is the same as all the other devices's GW]
>
> AFAIK, there is no way to view the routing table of the embedded print 
> server [JetDirect J6057A Firmware R.24.06]
>
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At one time you could ssh or telnet into the jetdirects.  It has been a 
while since I've done it.  You could see a lot more than what was 
displayed on the front panel.

Maybe they have finally locked that down.