ping trace problem,

Alright, this might appear a little confusing, all I know is that this problem is bugging me. We got ourselves a windows network with about 200 comps on it. We have a proxy server setup, it works fine, more or less. I was really confused about this before, until now. What I cant do is ping or trace SOME domains, like aol.com. Other ones I can do without a problem. Or if I use thgat visual trace program, it appears to go through with a high amount of packetloss(up to 90%). Here is my most recent traceroute, done with a max timeout of about 50000 to aol.com



Tracing route to aol.com [205.188.145.215]

over a maximum of 30 hops:



1 1 ms 2 ms 2 ms 10.94.38.1

2 57 ms 59 ms 101 ms 10.94.255.125

3 94 ms 97 ms 79 ms 10.94.8.55

4 66 ms 65 ms 59 ms 10.94.8.14

5 60 ms 60 ms 59 ms 63.124.135.1

6 316 ms 280 ms 228 ms 383.ATM1-0.GW7.MSP1.ALTER.NET [65.195.240.29]

7 398 ms 467 ms 781 ms 113.at-2-0-0.CL2.MSP1.ALTER.NET [152.63.69.102]

8 497 ms 490 ms 282 ms 0.so-1-0-0.TL2.CHI2.ALTER.NET [152.63.67.121]

9 307 ms 406 ms 670 ms 0.so-3-0-0.TL2.DCA6.ALTER.NET [152.63.19.170]

10 414 ms 451 ms 494 ms 0.so-4-0-0.XL2.IAD2.ALTER.NET [146.188.160.22]

11 635 ms 346 ms 561 ms POS6-0.ER5.IAD2.ALTER.NET [152.63.6.249]

12 313 ms 444 ms 425 ms pop4-dtc-P3-0.atdn.net [66.185.145.5]

13 443 ms 609 ms 539 ms bb1-dtc-P1-0.atdn.net [66.185.141.193]

14 398 ms 297 ms 295 ms pop1-dtc-P14-0.atdn.net [66.185.140.6]

15 535 ms 553 ms 489 ms 66.185.144.246

16 442 ms 416 ms 586 ms 172.18.126.74

17 172.18.126.78 reports: Destination net unreachable.


The last 172 address gives me the same error when I try to ping. Now 172.18 I thought at first was a private IP, but then I double checked and thats 172.16, so it must be another prob. I then whoised is on arin:

Search results for: 172.18.128.78

IANA (IANA-BBLK-RESERVED)
Internet Assigned Numbers Authority
4676 Admiralty Way, Suite 330
Marina del Rey, CA 90292-6695
US

Netname: IANA-BBLK-RESERVED
Netblock: 172.16.0.0 - 172.31.255.255

Coordinator:
Internet Corporation for Assigned Names and Numbers (IANA-ARIN) res-ip@iana.org
(310) 823-9358

Domain System inverse mapping provided by:

BLACKHOLE-1.IANA.ORG 192.0.32.18
BLACKHOLE-2.IANA.ORG 192.0.32.19

These blocks are reserved for special purposes.
Please see RFC 1918 for additional information.

Record last updated on 12-Oct-2001.
Database last updated on 6-Aug-2002 20:00:12 EDT.


Its the blackhole part that cought my eye. Now here is my final problem. When I go to the web, I can connect to aol.com without a problem.

Any ideas or more infor I need to give?

 

 

 

 

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