Non ideal IPv6 Anycast2 Routing

S_M
1 yr ago
8replies

Am in the UK. My ISP is Andrews & Arnold.

I am getting unusual routing for IPv6 Anycast2 via Taiwan I think.

Anycast1 is fine.

```

# traceroute6 2a07:a8c1::xx
traceroute to 2a07:a8c1::xx

1 t.gormless.thn.aa.net.uk (2001:8b0:0:53::127) 8.181 ms 8.273 ms 7.939 ms
2 n-aimless.thn.aa.net.uk (2001:8b0:0:53::104) 8.432 ms 8.067 ms 8.125 ms
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 as48024.ly.stuix.io (2a0f:5707:ffe3::92) 205.587 ms 2406:d400:1:133:203:163:222:156 (2406:d400:1:133:203:163:222:156) 220.452 ms as48024.ly.stuix.io (2a0f:5707:ffe3::92) 203.013 ms
11 po1-1950.cr01.tpe01.tw.misaka.io (2a0b:4342::99) 217.668 ms 215.349 ms 217.530 ms
12 po-12.lag.tpe01.tw.misaka.io (2407:b9c0:b000::12) 219.690 ms 217.584 ms 219.866 ms
```

Confirmed by ping.nextdns.io

```

anexia-lon 12 ms (anycast2, ultralow2)

anexia-lon (IPv6) 12 ms (ultralow2)

vultr-lon (IPv6) 12 ms (anycast1)

vultr-lon 12 ms (anycast1)

zepto-lon (IPv6) 12 ms (ultralow1)

zepto-lon 13 ms (ultralow1)

anexia-man 18 ms

anexia-man (IPv6) 18 ms

anexia-par 18 ms

vultr-ams (IPv6) 19 ms

anexia-par (IPv6) 19 ms

netbarista-par (IPv6) 19 ms

netbarista-par 20 ms

virtua-par 20 ms

vultr-ams 21 ms

zepto-bru (IPv6) 21 ms

virtua-par (IPv6) 24 ms

fusa-bru 25 ms

zepto-bru 25 ms

fusa-bru (IPv6) 28 ms

zepto-tpe (IPv6) 232 ms (anycast2)

```

S_M
1 yr ago
Reported - view

So looks like you've fixed it already? Or at least improved it? Thank you if so!

I'm getting `vultr-fra (IPv6)` instead of `zepto-tpe (IPv6)` for my anycast2, which is a lot closer...

Here's the `mtr`

                                                                    My traceroute  [v0.95]
A_A_x86 (2001:8b0:dc1b:1da1::1) -> 2a07:a8c1::31:527d (2a07:a8c1::xx:xxxx)                                                            2023-07-24T22:17:03+0100
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                                                                                      Packets               Pings
Host                                                                                                               Loss%   Snt   Last   Avg  Best  Wrst StDev
1. AS20712  t.gormless.thn.aa.net.uk (2001:8b0:0:53::127)                                                           0.0%    48    7.9   8.0   7.6   8.4   0.2
2. AS2914   ntt.a.needless.tch.aa.net.uk (2001:728:0:5000::67e)                                                     0.0%    48    8.2   8.1   7.6   8.7   0.2
3. AS2914   xe-0-0-0-3-7.r04.londen05.uk.bb.gin.ntt.net (2001:728:0:5000::67d)                                      0.0%    47    8.9   9.1   8.6  10.7   0.3
4. AS2914   ae-7.r20.londen12.uk.bb.gin.ntt.net (2001:728:0:2000::5d)                                               0.0%    47    8.8  11.1   8.3  30.1   4.6
5. AS2914   ae-1.r21.londen12.uk.bb.gin.ntt.net (2001:728:0:2000::11e)                                              0.0%    47    8.2  10.1   8.2  15.7   1.7
6. AS2914   ae-16.r20.frnkge13.de.bb.gin.ntt.net (2001:728:0:2000::15e)                                             0.0%    47   19.9  24.1  18.9  54.4   9.5
7. AS2914   ae-0.a03.frnkge13.de.bb.gin.ntt.net (2001:728:0:2000::51)                                               0.0%    47   23.1  28.1  18.8  52.4   7.7
8. AS2914   xe-1-4-2-3.a03.frnkge13.de.ce.gin.ntt.net (2001:728:0:5000::6f6)                                        0.0%    47   19.6  22.4  18.6  49.0   6.8
9. AS???    ethernetae2-sr2.fkt3.constant.com (2001:19f0:fc00::a4b:236)                                             0.0%    47   20.9  22.1  20.8  34.1   2.5
10. AS???    ethernetswp26-ds1-u3-r53b02-b.fkt3.constant.com (2001:19f0:fc00::a4b:39e)                               0.0%    47   19.2  19.4  19.0  20.2   0.3
11. (waiting for reply)
12. AS34939  dns2.nextdns.io (2a07:a8c1::xx:xxxx)                                                                    0.0%    47   20.2  20.5  20.1  21.1   0.2

Here's `ping.nextdns.io`

■ anexia-lon              10 ms  (anycast2, ultralow2)
  anexia-lon (IPv6)       11 ms  (ultralow2)
  vultr-lon               11 ms  (anycast1)
  vultr-lon (IPv6)        11 ms  (anycast1)
  zepto-lon (IPv6)        11 ms  (ultralow1)
  zepto-lon               11 ms  (ultralow1)
  vultr-ams (IPv6)        16 ms
  anexia-man (IPv6)       17 ms
  vultr-ams               17 ms
  anexia-par (IPv6)       17 ms
  virtua-par              18 ms
  netbarista-par          18 ms
  anexia-par              18 ms
  netbarista-par (IPv6)   18 ms
  anexia-man              18 ms
  zepto-bru (IPv6)        21 ms
  virtua-par (IPv6)       21 ms
  zepto-bru               22 ms
  vultr-fra (IPv6)        22 ms  (anycast2)
  fusa-bru                25 ms
  fusa-bru (IPv6)         27 ms

- chiefk60vitz
- 1 yr ago
- Reported - view
Any cast is something that hackers use to see your PC unless you're talking about the casting to the TV otherwise from your Android it should be using screen mirroring for any cast if that's what you're talking about but if you're otherwise if you do not using a screen mirroring program that's a hack to begin with
- R_P_M
  
  1 yr ago
  
  Reported - view
  That’s a completely different thing in this instance.
  
  What @s_m is talking about is a Anycast IP address, which in simple terms means for one IP address you can be routed to any number of different servers, in good practice to the closest possible server for your connection.
- Agi_Ga
- 4 mths ago
- Reported - view
Same for me. Something seems to be broken?

I do have:

zepto-tpe (IPv6) 330 ms (anycast2, ultralow2) zepto-tpe 331 ms (ultralow2)

From Germany... Why is it going there?
- Agi_Ga
  
  4 mths ago
  
  Reported - view
  Can someone explain this?
  
  It is only the zepto-tpe servers and it is doing this for a few weeks now. Is this bad routing?
- NextDNs
  
  4 mths ago
  
  Reported - view
  please open a new topic and provide a https://nextdns.io/diag
- Agi_Ga
  
  4 mths ago
  
  Reported - view
  Hope it's ok to give a short feedback here, as I cannot provide (privacy reasons) such a full report over here....
  
  When doing a diag I can clearly see, that the issue is somehow because of some weird routing of secondary PoP for anycast...
  
  Fetching PoP name for anycast primary IPv6 (2a07:a8c0::)
  zepto-fra: 3.559ms
  Fetching PoP name for anycast secondary IPv6 (2a07:a8c1::)
  zepto-tpe: 300.624ms
  
  Coming out of AS3320 landline network.
  
  Then going to TATA Network in FRA via ....ipv6.as6453.net
  
  And then the strange routing starts (all AS6453):
  
  FRA
  
  PARIS
  
  LONDON
  
  NEWYORK
  
  SANJOSE
  
  LOSANGELES
  
  TOYOHASHI
  
  TOKYO
  
  HONGKONG
  
  ... and ends in tpe somewhere.
  
  Looks like the route is wrong.
  
  When doing the same via mobile network AS3320 everything is working fine.
  
  So it must be some routing issue from AS3320 landline to your network.
  
  EDIT: We're talking about the same IPv6 as in the beginning of the post (2a07:a8c1::).
- NextDNs
  
  4 mths ago
  
  Reported - view
  without the diag we can't investigate.

Content aside

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4 mths agoLast active
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Non ideal IPv6 Anycast2 Routing

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