Automate
join:2001-06-26
Atlanta, GA
 ·Comcast
| IP traffic between Comcast and AT&T going through Dallas
Anybody know why data from a Comcast user in Atlanta is going through Dallas to get to a AT&T user in Atlanta?
Tracert from Comcast to AT&T
3 7 ms 9 ms 9 ms 68.85.91.137
4 10 ms 9 ms 13 ms te-9-2-ur02.b0atlanta.ga.atlanta.comcast.net [68.86.106.45]
5 7 ms 9 ms 9 ms te-9-4-ur01.b0atlanta.ga.atlanta.comcast.net [68.86.106.13]
6 9 ms 9 ms 8 ms be-20-crs01.b0atlanta.ga.atlanta.comcast.net [68.86.106.9]
7 11 ms 8 ms 9 ms pos-1-4-0-0-cr01.atlanta.ga.ibone.comcast.net [68.86.90.121]
8 34 ms 33 ms 101 ms pos-1-15-0-0-cr01.dallas.tx.ibone.comcast.net [68.86.85.149]
9 119 ms 35 ms 35 ms Vlan549.icore2.DTX-Dallas.as6453.net [206.82.142.5]
10 93 ms 36 ms 35 ms Vlan6.icore1.DTX-Dallas.as6453.net [209.58.47.13]
11 35 ms 33 ms 33 ms 192.205.35.57
12 54 ms 54 ms 52 ms cr2.dlstx.ip.att.net [12.122.138.106]
13 55 ms 54 ms 53 ms cr1.attga.ip.att.net [12.122.28.173]
14 54 ms 52 ms 62 ms gar8.attga.ip.att.net [12.122.141.61]
15 315 ms 408 ms 510 ms 12.87.227.122
Tracert from AT&T to Comcast
2 4 ms 4 ms 4 ms 12.87.227.121
3 25 ms 25 ms 24 ms cr1.attga.ip.att.net [12.122.141.62]
4 26 ms 24 ms 24 ms cr2.dlstx.ip.att.net [12.122.28.174]
5 23 ms 23 ms 27 ms ggr6.dlstx.ip.att.net [12.122.138.109]
6 59 ms 30 ms 40 ms 192.205.35.58
7 30 ms 35 ms 35 ms Vlan6.icore2.DTX-Dallas.as6453.net [209.58.47.14]
8 25 ms 24 ms 24 ms Vlan549.icore2.DTX-Dallas.as6453.net [206.82.142.6]
9 46 ms 50 ms 80 ms pos-0-9-0-0-cr01.nashville.tn.ibone.comcast.net[68.86.85.22]
10 41 ms 41 ms 41 ms te-7-4-ar01.nashville.tn.nash.comcast.net [68.86.90.134]
11 49 ms 49 ms 50 ms be-70-crs01.b0atlanta.ga.atlanta.comcast.net [68.85.232.125]
12 49 ms 48 ms 49 ms po-2-ur01.b0atlanta.ga.atlanta.comcast.net [68.86.106.10]
13 48 ms 49 ms 49 ms te-9-1-ur02.b0atlanta.ga.atlanta.comcast.net [68.86.106.14]
14 49 ms 49 ms 49 ms te-9-1-ur01.a1atlanta.ga.atlanta.comcast.net [68.86.106.46]
Notice that from AT&T to Comcast it is also going through Nashville.
You would think the two largest ISPs in town could keep the traffic local for a major city like Atlanta.
Is this an anomaly of these two IP addresses or are other people seeing the same thing?
Thanks, |
|
Napsterbater
Premium
join:2002-12-28
Milledgeville, GA
 ·Windstream
 ·BroadVoice
| reply to Automate
Re: IP traffic between Comcast and AT&T going through Dallas
Looks like Comcast and AT&T don't peer with each outher but they both peer with as6453.net wand the closest peering point for them is in Dallas.
I am kinda surprised that they aren't peering in Atalanta, I see Comcast peers with Level 3 in Atlanta AT&T Network is probably under a different AS number thus the as6453 looks as good as an AT&T -> Level 3 route, but that's the problem with BGP.
--
AMD Phenom II x3 720 BE @ 3.5Ghz(OC) | 4Gb Memory @ 1600mhz | Sapphire ATI HD4870 1GB 800mhz/1000mhz(OC) | 2x500GB HDD's Raid 0 | Windows 7 Ultimate x64 Build 7100 |
|
GhostDoggy
join:2005-05-11
Duluth, GA
| reply to Automate
While it is surprising they are not parallel peering on the local pop, it is even more surprising they are not parallel peering at all. But why would two unique competitors be reasonable about this anyways?  |
|
Automate
join:2001-06-26
Atlanta, GA
·Comcast
| reply to Automate
Well, I checked again and it is no longer going through Dallas. I am sure it was because of this post. 
Comcast to ATT
3 11 ms 8 ms 9 ms 68.85.91.137
4 11 ms 9 ms 9 ms te-9-2-ur02.b0atlanta.ga.atlanta.comcast.net [68.86.106.45]
5 11 ms 9 ms 9 ms te-9-4-ur01.b0atlanta.ga.atlanta.comcast.net [68.86.106.13]
6 11 ms 9 ms 9 ms be-20-crs01.b0atlanta.ga.atlanta.comcast.net [68.86.106.9]
7 11 ms 9 ms 8 ms pos-1-4-0-0-cr01.atlanta.ga.ibone.comcast.net [68.86.90.121]
8 14 ms 11 ms 9 ms pos-0-2-0-0-pe01.56marietta.ga.ibone.comcast.net [68.86.86.166]
9 12 ms 9 ms 8 ms 75.149.230.166
10 30 ms 12 ms 10 ms cr2.attga.ip.att.net [12.122.140.146]
11 13 ms 11 ms 11 ms cr84.attga.ip.att.net [12.123.22.250]
12 12 ms 9 ms 8 ms gar8.attga.ip.att.net [12.122.140.61]
13 18 ms 13 ms 13 ms 12.87.227.122
ATT to Comcast
2 4 ms 4 ms 4 ms 12.87.227.121
3 6 ms 5 ms 5 ms cr84.attga.ip.att.net [12.122.140.62]
4 6 ms 5 ms 5 ms cr2.attga.ip.att.net [12.123.22.249]
5 75 ms 124 ms 57 ms ggr3.attga.ip.att.net [12.122.140.145]
6 5 ms 5 ms 5 ms te-0-5-0-1-pe01.56marietta.ga.ibone.comcast.net[75.149.228.85]
7 6 ms 5 ms 5 ms pos-1-2-0-0-cr01.atlanta.ga.ibone.comcast.net [68.86.86.81]
8 7 ms 6 ms 6 ms pos-0-14-0-0-crs01.b0atlanta.ga.atlanta.comcast.net [68.86.90.126]
9 5 ms 5 ms 5 ms po-2-ur01.b0atlanta.ga.atlanta.comcast.net [68.86.106.10]
10 5 ms 5 ms 5 ms te-9-1-ur02.b0atlanta.ga.atlanta.comcast.net [68.86.106.14]
11 6 ms 6 ms 5 ms te-9-1-ur01.a1atlanta.ga.atlanta.comcast.net [68.86.106.46] |
|
Napsterbater
Premium
join:2002-12-28
Milledgeville, GA | Looks good but I doubt its "because of this post" looks like they have started to peer (before they weren't) which is allowing the traffic to stay local. |
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Automate
join:2001-06-26
Atlanta, GA | You must not have noticed the wink. |
|
Napsterbater
Premium
join:2002-12-28
Milledgeville, GA | Oh i was wondering what that tennis ball was at the end of you post.
>.>
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