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2437
Automate
join:2001-06-26
Atlanta, GA

Automate

Member

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,
Expand your moderator at work

Napsterbater
Meh
MVM
join:2002-12-28
Milledgeville, GA
(Software) OPNsense
Ubiquiti UniFi UAP-AC-PRO

Napsterbater to Automate

MVM

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.
GhostDoggy
join:2005-05-11
Duluth, GA

GhostDoggy to Automate

Member

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

Automate

Member

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
Meh
MVM
join:2002-12-28
Milledgeville, GA

Napsterbater

MVM

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.
Automate
join:2001-06-26
Atlanta, GA

Automate

Member

You must not have noticed the wink.

Napsterbater
Meh
MVM
join:2002-12-28
Milledgeville, GA

Napsterbater

MVM

Oh i was wondering what that tennis ball was at the end of you post.

>.>

.