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Doctor Feelgood
Arrrrghh!
Joined: 07 Apr 2003
Posts: 20349
Location: New Jersey
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 Posted: Tue, 26 Apr 2005 15:35:12 Post Subject: Diagnosing a TraceRoute |
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I have always had many steps to get to the new server, and it has always had one time out step in the process. Now I have four time outs, but the site still seems OK... 
| Quote: | ...
5 11 ms 12 ms 12 ms sw1.phla1.atx.net [146.145.78.6]
6 9 ms 9 ms 20 ms core02.phla1.atx.net [146.145.78.5]
7 12 ms 10 ms 10 ms phlapa1wce2-pos5-1.wcg.net [65.77.115.109]
8 32 ms 12 ms 12 ms nycmny2wcx3-pos0-2.wcg.net [64.200.210.34]
9 24 ms 13 ms 13 ms nycmnyzlce1-pos4-0.wcg.net [64.200.87.86]
10 28 ms 48 ms 31 ms aer1-gigabitethernet4-4.NewYork.savvis.net [206.24.193.205]
11 12 ms 12 ms 12 ms dcr3-ae2.NewYork.savvis.net [208.174.228.9]
12 30 ms 14 ms 15 ms bcs2-so-3-0-0-500.NewYork.savvis.net [204.70.192.202]
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * 72 ms 58 ms bcr1-so-1-0-0-500.Dallas.savvis.net [204.70.193.17]
17 68 ms 105 ms 97 ms ohr1-pos-4-0.FortWorthda1.savvis.net [208.172.131.82]
18 69 ms 75 ms 67 ms 216.39.64.3
19 76 ms 130 ms 54 ms 216.39.69.238
20 * * * Request timed out.
21 68 ms 96 ms 95 ms 30.129.36.72.reverse.layeredtech.com [72.36.129.30] |
It takes 4 steps just to get out of my office... That drop in step 20 is always there, but 13-16 usually aren't, so total is generally 16-17 steps. Should I say wassup to Savvis? |
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Little Bruin
Boo Boo
Joined: 07 Apr 2003
Posts: 667
Location: Pic-A-Nic Basket |
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IceNine
*The Freshest*
Joined: 08 Sep 2003
Posts: 1459
Location: Bel Air
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| Posted: Tue, 26 Apr 2005 15:40:55 Post Subject: |
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Those parts might just drop a ping request.
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Doctor Feelgood
Arrrrghh!
Joined: 07 Apr 2003
Posts: 20349
Location: New Jersey
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| Posted: Tue, 26 Apr 2005 15:44:37 Post Subject: |
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Trace to the site's old server... Both of which are in different Dallas Texas data centers...
| Quote: |
...
5 41 ms 45 ms 47 ms core02.phla0.atx.net [146.145.78.131]
6 42 ms 9 ms 10 ms 67.17.159.129
7 50 ms 94 ms 73 ms so1-0-0-2488m.ar1.dal2.gblx.net [67.17.73.34]
8 45 ms 81 ms 45 ms The-Planet.ge-0-2-1.ar1.DAL2.gblx.net [64.213.176.150]
9 90 ms 73 ms 70 ms dist-vlan31.dsr3-1.dllstx3.theplanet.com [70.85.127.29]
10 46 ms 46 ms 75 ms dist-vlan41.dsr2-1.dllstx4.theplanet.com [70.85.127.83]
11 57 ms 46 ms 57 ms gig1-0-2.sm-car7-1.dllstx4.theplanet.com [67.18.116.51]
12 52 ms 46 ms 85 ms 58.67-18-247.reverse.theplanet.com [67.18.247.58]
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Umm? |
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IceNine
*The Freshest*
Joined: 08 Sep 2003
Posts: 1459
Location: Bel Air
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| Posted: Tue, 26 Apr 2005 15:50:30 Post Subject: |
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Same datacenter, but completely different networks if I'm not mistaken.
Where's Cheeze when you need him?
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A letter to a soldier |
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Doctor Feelgood
Arrrrghh!
Joined: 07 Apr 2003
Posts: 20349
Location: New Jersey
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IceNine
*The Freshest*
Joined: 08 Sep 2003
Posts: 1459
Location: Bel Air
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| Posted: Tue, 26 Apr 2005 16:01:13 Post Subject: |
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Perhaps some of this may apply?
| Quote: | Traceroutes to certain NTL servers always look wrong when there is nothing in fact wrong. For instance:
C:\WINDOWS>tracert www.ntl.com
Tracing route to www.ntl.com [212.250.5.110]
over a maximum of 30 hops:
1 18 ms 19 ms 72 ms 172.16.231.254
2 17 ms 15 ms 14 ms cam-cam1-a-fa00.inet.ntl.com [62.253.129.1]
3 21 ms 13 ms 15 ms cam-core-a-pos200.inet.ntl.com [62.253.128.133]
4 27 ms 24 ms 25 ms lng-bb-a-atm100-808.inet.ntl.com [62.253.187.42]
5 21 ms 28 ms 24 ms gfd-bb-a-so-110-0.inet.ntl.com [62.253.188.246]
6 27 ms 46 ms 24 ms gfd-dc-a-ge400.inet.ntl.com [62.253.188.154]
7 23 ms 29 ms 62 ms gfd-alder-fa10.inet.ntl.com [194.168.2.1]
8 21 ms 23 ms 20 ms 62.252.0.98
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * * Request timed out.
17 17 ms 9 ms 24 ms www.ntl.com [212.250.5.110]
Trace complete.
The server at www.ntl.com has a defect in its TCP/IP implementation in that it sets the TTL of an ICMP echo to be the same as the residual TTL of the ICMP query. This means that the ICMP echo will be dropped by some router in the return path, until such time as the originating traceroute program has increased the TTL on the query packet to account for the number of hops in the return path as well as the outward path. This fools the traceroute program into inventing hops 9 to 16, which really don't exist: www.ntl.com is in fact directly connected to the router in hop 8. It is characteristic of this defect that one sees the same number of missing hops (8 in this case) as the number of genuine hops before the gap, assuming the return path is the same as the outward one. There is no evidence of any network problem in the above traceroute. |
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BeerCheeze
*hick*
Joined: 14 Jun 2003
Posts: 9285
Location: At the Bar
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| Posted: Tue, 26 Apr 2005 18:04:36 Post Subject: |
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Ehhh... traceroutes can change. Routers on the internet route traffic via which ever path at that time has the lowest traffic load. So a trace in the AM may well use a different path then one in the PM.
Also, busy routers will not answer a trace/ping. ICMP packets (what ping/traceroute use) have a low priority. So if a router is busy, it won't answer the request.
OOO... and I was taking another frigg'n MS test.  |
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Little Bruin
Boo Boo
Joined: 07 Apr 2003
Posts: 667
Location: Pic-A-Nic Basket |
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Digital Eclipse
Rated R
Joined: 20 Jul 2004
Posts: 50
Location: Ocala, FL
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Doctor Feelgood
Arrrrghh!
Joined: 07 Apr 2003
Posts: 20349
Location: New Jersey
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| Posted: Tue, 26 Apr 2005 20:22:09 Post Subject: |
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From home... different ISP, similar results...
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...
2 11 ms 9 ms 15 ms 10.72.64.1
3 11 ms 13 ms 10 ms dstswr2-vlan2.rh.rndhnj.cv.net [67.83.249.162]
4 14 ms 11 ms 10 ms r2-ge9-2.mhe.prnynj.cv.net [67.83.249.133]
5 10 ms 11 ms 9 ms r2-srp3-0.wan.prnynj.cv.net [65.19.112.130]
6 14 ms 10 ms 11 ms r1-srp1-0.in.nycmny83.cv.net [65.19.96.53]
7 12 ms 11 ms 20 ms dcr3-so-5-3-0.NewYork.savvis.net [206.24.207.25]
8 12 ms 13 ms 12 ms bcs2-so-3-0-0-500.NewYork.savvis.net [204.70.192.202]
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 50 ms 50 ms 50 ms bcr1-so-1-0-0-500.Dallas.savvis.net [204.70.193.17]
13 51 ms 51 ms 50 ms ohr1-pos-4-0.FortWorthda1.savvis.net [208.172.131.82]
14 52 ms 51 ms 54 ms 216.39.64.18
15 52 ms 52 ms 62 ms 216.39.69.238
16 * * * Request timed out.
17 51 ms 52 ms 51 ms 30.129.36.72.reverse.layeredtech.com [72.36.129.30]
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BeerCheeze
*hick*
Joined: 14 Jun 2003
Posts: 9285
Location: At the Bar
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| Posted: Tue, 26 Apr 2005 22:11:57 Post Subject: |
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| Digital Eclipse wrote: | | Hey DE what exam? I have 3 more to take before I get my MCSA, then on to Cicso |
I have to get my MCSE...  Company requires it.
Didn't have time to study, and lost my Cisco Cert... O'well. After I get done with the MCSE, I'll go back and get it. |
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