Hello!
Macomnet (ISP, AS8470, Moscow, Russia) uses world connectivity via
Teleglobe. We have a router, managed by us, in NY. The interface pointing
to America uses Teleglobe's address and another one, pointing to Moscow
- ours.
Regullary I see a quite strange heavy delays on Teleglobe to
Alternet interconnect point. I traced the route to several
destinations with SRC addresses from Teleglobe's and Macomnet's IP blocks.
The problem is that packets with SRC from Teleglobe address space passes
through with lower delays than packets with Macomnet's SRC addresses.
The first thing what people expect is assymetric routing (i.e. route from
Alternet goes another way back to us). But it's not possible. Our backup
provider (AS8342) plugs into Teleglobe also. So Teleglobe advertises the
right route to Alternet and it's quite impossible for Alternet to have
another route to Macomnet. I believe it's not a routing problem.
I contacted Teleglobe and they said that it could be a temporary
congestion. I wonder how could congestion exist for Macomnet addresses
and not to appear for Teleglobe itself!!! That is the question.
Look at the traces below. The first one uses Teleglobe SRC address, the
second - ours.
Hi,
Another strange thing is that Teleglobe passes packets coming via
AS8342 the same way as you showed with Teleglobe's IP addresses.
It is a trace from my office.
[lost]:[2:01:17pm][pts/1]%[~]> traceroute 204.71.127.3
traceroute to 204.71.127.3 (204.71.127.3), 30 hops max, 38 byte packets
1 jam-4-e0-0.zenon.Net (195.2.69.65) 1.887 ms 1.115 ms 1.931 ms
2 m9-2-atm3-0-9-2-103.zenon.Net (195.2.73.221) 2.016 ms 2.043 ms
2.017 ms
3 m9-3-fa1-1-0-90.zenon.Net (195.2.70.3) 10.886 ms 5.206 ms 6.356
ms
4 m3-bvi-1.msk-m9.RosTelecom.net (195.161.2.133) 3.760 ms 7.434 ms
3.860 ms
5 c1-s0-1-0.NewYork.RosTelecom.Net (195.161.161.162) 124.627 ms
135.079 ms 212.080 ms
6 if-2-0-0.bb6.NewYork.Teleglobe.net (207.45.205.29) 124.108 ms
138.293 ms 134.732 ms
7 if-6-0-0.bb1.NewYork.Teleglobe.net (207.45.221.67) 124.241 ms
124.444 ms 128.004 ms
8 Serial0-1-0.GW2.NYC2.ALTER.NET (157.130.4.165) 159.963 ms 128.290
ms 157.130.5.217 (157.130.5.217) 131.942 ms
9 144.ATM2-0.XR2.EWR1.ALTER.NET (146.188.178.158) 146.279 ms 139.127
ms 156.021 ms
10 192.ATM3-0.TR2.EWR1.ALTER.NET (146.188.176.86) 138.311 ms 128.993
ms 147.531 ms
11 105.ATM6-0.TR2.DCA8.ALTER.NET (146.188.138.173) 273.422 ms 244.176
ms 240.139 ms
12 152.63.32.209 (152.63.32.209) 125.812 ms 126.926 ms 147.801 ms
13 192.ATM6-0.GW5.TCO1.ALTER.NET (146.188.162.165) 137.129 ms 124.777
ms 143.391 ms
14 intrepid-gw2.customer.ALTER.NET (157.130.36.214) 242.036 ms
258.814 ms 244.446 ms
15 office-shep.intrepid.net (209.190.129.38) 238.867 ms 250.612 ms
243.025 ms
16 intrepid.net (204.71.127.3) 288.863 ms 243.229 ms 237.784 ms
[lost]:[2:01:25pm][pts/1]%[~]>
"Dmitry S. Esakov" wrote: