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SDRNews needs help with DNS problem. May be Cox specific.

by Owyn / February 28, 2007 9:46 PM PST

" Mark -

Thanks for writing to Todd at GNC to inquire about the show.

I changed to a different server February 1st to increase overall reliability and in the transition there have been troubles, mostly with Cox subscribers, that apparently is traceable to problems in cached DNS information and ACL lists.

You could be of great help if you could do a traceroute or tracert to, and email me a copy of the results. It appears that a machine formerly at that IP address at GoDaddy had been repeatedly attacked from various blocks within Cox but that an exact IP address for the attacker was not determined. Godaddy and Cox both have selectively blocked certain portions and addresses and if I can get listeners to do a traceroute attempt we can determine where the blockage exists. The more data points we can get will help us converge on the problem ACL.

If you have friends who are also SDR listeners or non-listeners that you could ask to send in a ping report it would really help.


Andy McCaskey"

A clean ping and traceroute should look something like this.


Pinging [] with 32 bytes of data:

Reply from bytes=32 time=218ms TTL=49
Reply from bytes=32 time=244ms TTL=49
Reply from bytes=32 time=257ms TTL=49
Reply from bytes=32 time=184ms TTL=49

Ping statistics for
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 184ms, Maximum = 257ms, Average = 225ms

If the ping does not resolve to, then Andy would really like to see a traceroute.


Tracing route to []
over a maximum of 30 hops:

1 73 ms 49 ms 252 ms
2 163 ms 70 ms 52 ms []
3 209 ms 170 ms 53 ms []
4 122 ms 164 ms 47 ms []
5 131 ms 102 ms 92 ms []
6 167 ms 146 ms 59 ms []
7 199 ms 56 ms 157 ms []
8 76 ms 106 ms 55 ms []
9 56 ms 62 ms 398 ms []
10 * * * Request timed out.
11 101 ms 101 ms 390 ms []
12 102 ms 249 ms 167 ms
13 187 ms 214 ms 106 ms []
14 124 ms 275 ms 247 ms []
15 327 ms 200 ms 115 ms []
16 134 ms 147 ms 106 ms []
17 169 ms 278 ms 178 ms []

Trace complete.

Thanks in advance for any help. If you can post any failing traceroutes here I will forward them to Andy

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