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How does AS peering works?
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How does AS peering works?

scyscy Member

Hi

been checking AS2010648 and i'm surprised to see that they have peer in various countries, far from each other.

http://bgp.he.net/AS201048#_peers

How is that possible? i did believe that it was related to real physical peers on the network, how come can a peer be far far away? or is it that the AS as presences in various DC?

Thanks!

Comments

  • ClouviderClouvider Member, Patron Provider

    AS can be registered in one country but network can span across entire world, for example GTT. AS reports Germany I believe, and the network spans worldwide.

    Thanked by 1scy
  • singsingsingsing Member
    edited September 2015

    They have as many prefixes as peers on both ipv4 and ipv6. So this is basically just a vanity AS setup as far as I can tell, they could just as easily have had their upstreams put the prefixes in the upstream BGP.

    Thanked by 1scy
  • He's tool is not telling you the whole truth. There are 4 distinct /24s originated from this AS and each one is advertised in a different country and is routed (singlehomed) by one of the 4 ISPs you see on this web page.

    Thanked by 1scy
  • This ASN routes 4 /24 in 4 different DCs - Thus they list 4 upstreams

    EDIT: damn rds100 !

    On the contrary this one routes a few /24 in many locations (anycast): http://bgp.he.net/AS198412#_peers

    Thanked by 1scy
  • Thanks! Perfect answers :)

  • William said: On the contrary this one routes a few /24 in many locations (anycast): http://bgp.he.net/AS198412#_peers

    This one also needs some work to stop your VOCUS announcement from leaking to the US : https://pulse.turbobytes.com/results/55f48079ecbe400bf8001872/

    1.  |-- 198.12.15.201 - AS40065 - 201.15.12.198.in-addr.arpa.static.cnservers.com. 
    0   10  0.61    0.64    0.60    0.71    0.04
    2.  |-- 192.168.247.1 
    0   10  0.33    2   0.33    14  4
    3.  |-- 192.168.240.5 
    0   10  24  55  0.44    136 51
    4.  |-- 216.243.26.153 - AS11404 - cr2-pdx-t3-3.spectrumnet.us. 
    0   10  5   5   4   5   0.18
    5.  |-- 174.127.140.218 - AS11404 - cr1-9greatoaks-te-0-7-0-4.bb.spectrumnet.us. 
    0   10  19  20  19  20  0.14
    6.  |-- 206.223.116.227 - swt01.sjc02.ca.vocusconnect.net. 
    0   10  20  20  20  21  0.14
    7.  |-- 114.31.199.248 - AS4826 - ten-0-0-0-0.cor02.sjc01.ca.VOCUS.net. 
    0   10  176 176 176 176 0.14
    8.  |-- 114.31.199.45 - AS4826 - ten-0-2-0-2.cor01.syd04.nsw.VOCUS.net.au. 
    0   10  175 175 175 175 0.20
    9.  |-- 175.45.72.93 - AS4826 - ten-0-0-0.bdr03.syd04.nsw.VOCUS.net.au. 
    0   10  175 175 175 176 0.11
    10. |-- 175.45.73.58 - AS4826 - as7604.cust.bdr03.syd04.nsw.VOCUS.net.au. 
    0   10  175 175 175 176 0.05
    11. |-- 203.7.225.18 - AS7604 - xe-3-682-rt2.sydvc.as7604.net. 
    0   10  175 175 175 175 0.13
    12. |-- 119.252.76.80 - AS7604 - dns-ap-au.rage4.com. 
    0   10  175 176 175 176 0.11
    13. |-- 176.124.112.100 - AS198412 - ns1.r4ns.com. 
    0   10  186 192 186 202 7
    
    1.  |-- 67.18.7.162 - AS21844 - router2-dal.linode.com. 
    0   10  0.57    0.59    0.49    0.75    0.09
    2.  |-- 67.18.7.93 - AS21844 - ae2.car02.dllstx2.networklayer.com. 
    0   10  0.45    4   0.30    34  11
    3.  |-- 70.87.254.81 - AS21844 - po102.dsr01.dllstx2.networklayer.com. 
    0   10  0.62    0.79    0.62    2   0.28
    4.  |-- 70.87.255.65 - AS21844 - po21.dsr01.dllstx3.networklayer.com. 
    0   10  0.77    0.76    0.67    0.85    0.05
    5.  |-- 173.192.18.226 - AS36351 - ae17.bbr01.eq01.dal03.networklayer.com. 
    0   10  1   2   0.56    8   2
    6.  |-- 173.192.18.141 - AS36351 - ae0.bbr01.cs01.lax01.networklayer.com. 
    0   10  32  32  31  32  0.44
    7.  |-- ????    100 10  0.00    0.00    0.00    0.00    0.00
    8.  |-- 114.31.199.60 - AS4826 - bundle-101.cor01.lax01.ca.VOCUS.net. 
    0   10  195 195 194 195 0.20
    9.  |-- 114.31.199.63 - AS4826 - bundle-102.cor01.sjc01.ca.VOCUS.net. 
    0   10  193 193 193 193 0.08
    10. |-- 114.31.199.59 - AS4826 - bundle-100.cor02.sjc01.ca.VOCUS.net. 
    0   10  195 195 195 195 0.06
    11. |-- 114.31.199.58 - AS4826 - bundle-100.cor01.sjc01.ca.VOCUS.net. 
    0   10  192 192 192 192 0.10
    12. |-- 114.31.199.84 - AS4826 - ten-0-1-0-5.cor01.syd04.nsw.VOCUS.net.au. 
    0   10  192 192 192 192 0.05
    13. |-- 175.45.72.77 - AS4826 - ten-2-0-0.bdr03.syd04.nsw.VOCUS.net.au. 
    0   10  195 195 195 195 0.04
    14. |-- 175.45.73.58 - AS4826 - as7604.cust.bdr03.syd04.nsw.VOCUS.net.au. 
    0   10  195 195 195 196 0.30
    15. |-- 203.7.225.18 - AS7604 - xe-3-682-rt2.sydvc.as7604.net. 
    0   10  195 195 195 195 0.07
    16. |-- 119.252.76.80 - AS7604 - dns-ap-au.rage4.com. 
    0   10  196 196 196 196 0.08
    17. |-- 176.124.112.100 - AS198412 - ns1.r4ns.com. 
    0   10  223 214 202 225 7
    

    Seems to be some outliers in the US, otherwise pretty good. Should ask Zettagrid to send some communities upstream to avoid VOCUS peering screwing some vital US connections. Or maybe it's an EU optimized Anycast network?

    They need more eyeballs in the US. CatchPoint could help with that.

    http://www.catchpoint.com/

    Better than a lot of providers who announce EVERY location then wonder what a balanced AS-path is. Better than most Anycast setups I've seen, but not without its sinkholes :)

  • WilliamWilliam Member
    edited September 2015

    GStanley said: This one also needs some work to stop your VOCUS announcement from leaking to the US : https://pulse.turbobytes.com/results/55f48079ecbe400bf8001872/

    i'm sure @gbshouse can fix that (or have it fixed) - clearly not ideal, will debug it a bit more and send some info over.

    US is always an issue as the large ISPs don't peer locally (like Comcast backhauls a lot of traffic to LA, NY etc.) and the local DCs can't really improve that - Only the Akamai/Edgecast system (place servers with them directly) works then but is extremely expensive (obviously)

  • patrick7patrick7 Member, LIR

    Unfortunately that's not only in the states. There are some ISPs in Europe too, which do not understand how the internet works (have a look at AS3320, AS6830).

  • With the example above of http://bgp.he.net/AS201048#_peers and also http://bgp.he.net/AS198412#_peers I think its easy enough to understand since its essentially multiple upstreams (and in AS198412, anycasted on the same /24 prefix)

    However what I would love to know if anyone is willing to explain is how does the non default route peering work? for example if you have an ASN that has infrastructure in one location but and have 500+ peers from all over the world.

    I understand that when one is in an IX they can peer with whoever (in that IX), meaning you get "free traffic" between you and that said peer, but what happens if your infrastructure is physically located outside that IX facility?

    Example: If you run a website service in a datacenter located in say USA. and you want to peer with an ISP that has presence in say AMS-IX. Sure you can place a router/server in the IX and peer that said ISP. but what do you do with the traffic then? backhaul it using transit back to your USA datacenter essentially not getting free traffic at all? the only way I see this being "free" is only if you own the lines between your DC and the IX factuality (which is not realistic for the average joe)

    tl;dr how does IX peering work?

  • ClouviderClouvider Member, Patron Provider

    Then you buy L2 od L1 to such location to pick the traffic up.

  • Exactly. And this is still cheaper than transit - 10GE wave AMS-NYC costs around 8000$, 10GE transit in either costs around 10000$.

  • sidk1982sidk1982 Member
    edited October 2022

    Sounds like a new [removed] can also help with your analysis.

  • ArkasArkas Moderator

    @sidk1982 said: Sounds like a new digital experience monitoring tool can also help with your analysis.

    Sounds like you might be spamming?

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