[Cialug] networking problems
Dave Weis
djweis at sjdjweis.com
Sun Jul 17 09:47:51 CDT 2005
Turn off the proxy settings in firefox.
On Sun, 17 Jul 2005, n.d wrote:
> browser: firefox (on all machines)
> error message: "The connection was refused when attempting to contact *****"
> proxy: no thank you.
> routing table:
>
> (linux)Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt
> Iface
> 192.168.123.0 * 255.255.255.0 U 0 0 0 eth0
> 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
> default 192.168.123.1 0.0.0.0 UG 0 0 0 eth0
>
> (windows routing table. beware its scary.)
> Network Destination Netmask Gateway Interface Metric
> 0.0.0.0 0.0.0.0 192.168.123.1 192.168.123.4 20
> 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
> 192.168.123.0 255.255.255.0 192.168.123.4 192.168.123.4 20
> 192.168.123.4 255.255.255.255 127.0.0.1 127.0.0.1 20
> 192.168.123.255 255.255.255.255 192.168.123.4 192.168.123.4 20
> 224.0.0.0 240.0.0.0 192.168.123.4 192.168.123.4 20
> 255.255.255.255 255.255.255.255 192.168.123.4 192.168.123.4 1
> Default Gateway: 192.168.123.1
>
> traceroute to www.cnet.com:
> traceroute to c10-ssa-xw-lb.cnet.com (216.239.115.141), 30 hops max, 38 byte
> packets
> 1 192.168.123.1 (192.168.123.1) 5.427 ms 5.171 ms 0.906 ms
> 2 10.17.224.1 (10.17.224.1) 14.929 ms 16.012 ms 25.858 ms
> 3 12-215-16-169.client.mchsi.com (12.215.16.169) 13.201 ms 20.414 ms
> 20.851 ms
> 4 12-215-5-6.client.mchsi.com (12.215.5.6) 29.101 ms 25.932 ms 28.772 ms
> 5 tbr1-p011801.cgcil.ip.att.net (12.123.6.58) 69.979 ms 69.100 ms 74.897
> ms
> MPLS Label=32430 CoS=5 TTL=1 S=0
> 6 tbr1-cl1.sffca.ip.att.net (12.122.10.6) 69.086 ms 68.957 ms 68.846 ms
> MPLS Label=32441 CoS=5 TTL=1 S=0
> 7 gar4-p300.sffca.ip.att.net (12.123.13.174) 66.468 ms 68.680 ms 79.969
> ms
> 8 idf22-gsr12-1-pos-6-0.rwc1.attens.net (12.122.255.222) 84.092 ms 73.723
> ms 68.881 ms
> 9 mdf3-bi4k-1-eth-1-1.rwc1.attens.net (216.148.209.62) 69.123 ms 66.730 ms
> 70.334 ms
> 10 63.241.72.146 (63.241.72.146) 67.872 ms 73.085 ms 77.695 ms
> 11 63.241.72.146 (63.241.72.146) 70.027 ms !X * 71.228 ms !X
> [root at network config]# traceroute www.us.army.mil
> traceroute to www.us.army.mil (143.69.243.36), 30 hops max, 38 byte packets
> 1 192.168.123.1 (192.168.123.1) 1.127 ms 4.883 ms 0.864 ms
> 2 10.17.224.1 (10.17.224.1) 15.985 ms 23.009 ms 11.821 ms
> 3 12-215-16-169.client.mchsi.com (12.215.16.169) 16.088 ms 14.095 ms
> 17.577 ms
> 4 12-215-5-2.client.mchsi.com (12.215.5.2) 27.920 ms 24.915 ms 29.009 ms
> 5 tbr1-p012301.cgcil.ip.att.net (12.123.6.9) 32.406 ms 37.678 ms 25.964
> ms
> MPLS Label=32479 CoS=5 TTL=1 S=0
> 6 ggr2-p300.cgcil.ip.att.net (12.123.6.33) 28.986 ms 24.970 ms 29.934 ms
> 7 att-gw.chi.qwest.net (192.205.32.98) 30.922 ms 23.589 ms 28.645 ms
> 8 cer-core-01.inet.qwest.net (205.171.139.57) 30.621 ms 25.643 ms 23.988
> ms
> 9 dca-edge-13.inet.qwest.net (205.171.209.74) 50.892 ms 64.519 ms 57.270
> ms
> 10 67.133.229.126 (67.133.229.126) 48.980 ms 48.064 ms 47.253 ms
> 11 198.26.76.33 (198.26.76.33) 50.130 ms 49.536 ms 53.938 ms
> 12 33.1.1.98 (33.1.1.98) 68.983 ms 71.017 ms 80.984 ms
> 13 198.26.215.114 (198.26.215.114) 102.197 ms 78.949 ms 111.950 ms
> 14 * * * (etc etc etc to infinity)
>
> this i believe is where the problems arise. whats odd is i just noticed that
> i can access this site from my server but not my other machines. the
> investigation continues.
>
>
> Kenneth Ristau wrote:
>
>> n.d wrote:
>>
>>> root at network~# host www.us.army.mil 192.168.123.101
>>> Using domain server:
>>> Name: 192.168.123.101
>>> Address: 192.168.123.101#53
>>>
>>> www.us.army.mil has address 143.69.243.36
>>>
>>>
>> --SNIP--
>>
>> OK, looks like your DNS is working correctly, so we need to look at
>> something else. What browser are you using to access these sites, and
>> what error message (if any) do you get when you try to access them? Are
>> you using a proxy? If so, can you by-pass it for testing, and what
>> happens when you do?
>>
>> If you suspect routing, try doing a traceroute on the IP of each of your
>> example sites. Perhaps include the results of those traceroutes and
>> your routing table in your reply. I don't think it is routing, though.
>> If it was, I would expect to see you unable to access any site at all,
>> not just a select few.
>>
>> later,
>> kristau
>>
>
>
>
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>
--
Dave Weis "I believe there are more instances of the abridgment
djweis at sjdjweis.com of the freedom of the people by gradual and silent
encroachments of those in power than by violent
and sudden usurpations."- James Madison
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