Anurag BhatiaCheckout my latest blog post on cold potato routing between Airtel #AS9498 & Tata Comm #AS4755 in India.
https://anuragbhatia.com/post/2026/05/airtel-tata-comm-routing/
Checkout my latest blog post on Airtel India - Europe routing issues -https://anuragbhatia.com/post/2026/01/eu-india-routing-issues/
Airtel India - Europe routing issues
Since 20:08 IST / 14:38 GMT on 28 Jan 2026, the latency between Airtel India and Europe has gone up along with significant packet loss. Here’s an example of shortlist 300+ endpoints from Airtel India with European endpoints: Traceroutes Airtel Haryana -> Contabo Europe Start: 2026-01-29T03:52:33+0530 HOST: desktop Loss% Snt Last Avg Best Wrst StDev 1. AS??? _gateway (172.16.0.1) 0.0% 10 0.2 0.2 0.2 0.2 0.0 2. AS??? 10.240.9.204 0.0% 10 6.2 7.7 4.6 17.7 3.7 3. AS??? 172.31.0.155 0.0% 10 12.1 8.4 5.0 12.8 3.2 4. AS9498 173.168.18.125.dhcp.anaronline.net (125.18.168.173) 0.0% 10 5.1 6.5 5.0 8.0 1.2 5. AS??? 182.79.243.34 0.0% 10 266.6 262.7 259.1 276.3 5.3 6. AS1299 lax-b22-link.ip.twelve99.net (62.115.162.62) 0.0% 10 259.4 258.1 256.6 259.9 1.1 7. AS1299 lax-bb2-link.ip.twelve99.net (62.115.140.156) 10.0% 10 256.7 257.9 256.6 259.6 1.2 8. AS1299 dls-b7-link.ip.twelve99.net (62.115.140.247) 20.0% 10 323.4 324.2 322.6 326.2 1.2 9. AS1299 atl-b24-link.ip.twelve99.net (62.115.140.32) 0.0% 10 336.4 336.5 335.4 338.0 0.9 10. AS1299 atl-bb2-link.ip.twelve99.net (62.115.143.236) 0.0% 10 323.1 321.7 320.2 323.4 1.0 11. AS1299 ash-bb2-link.ip.twelve99.net (62.115.137.132) 40.0% 10 320.9 321.1 320.6 321.7 0.4 12. AS1299 prs-bb2-link.ip.twelve99.net (62.115.140.106) 0.0% 10 318.8 318.3 317.2 319.5 0.9 13. AS1299 laut-b2-link.ip.twelve99.net (62.115.136.185) 0.0% 10 325.7 326.0 324.3 327.7 1.3 14. AS1299 contabohubeurope-ic-385701.ip.twelve99-cust.net (213.248.67.11) 0.0% 10 325.8 324.4 322.8 326.4 1.2 15. AS??? ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 16. AS??? ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 17. AS51167 eu01.anuragbhatia.com (213.199.54.67) 0.0% 10 323.1 323.5 322.4 324.9 0.9 Reading this trace: This is Ambala » Airtel MPLS » Los Angeles Arelion AS1299 handover > Arelion Dallas > Arelion Atlanta > Arelion Ashburn > Arelion Paris > Europe
sahilisterLooks like authoritative name servers for airtel.in (ie AS9498) aren't responding on IPv6.
```
$ dig +short airtel.in @dnsdel.mantraonline.com.
;; communications error to 2404:a800:0:14::1:1212#53: timed out
;; communications error to 2404:a800:0:14::1:1212#53: timed out
;; communications error to 2404:a800:0:14::1:1212#53: timed out
;; communications error to 2404:a800:0:b::9#53: timed out
125.16.74.90
```
1/3
Checkout my latest blog post on #AS9498 peering in Russia - https://anuragbhatia.com/post/2024/10/bharti-airtel-starts-peering-in-russia/
Shrirang KahaleThere seems to be some problems with Contabo (Mumbai)'s upstream transit. A lot of packetloss between them and #AS9498
Latency spike to Fastly from #AS9498 (Airtel India) Nagpur over IPv6 to Fastly Mumbai node. (90ms)
The traceroute shows that it (might) be going through Bangalore but still the latency is too much, the return path might be different which is causing this.
IPv4 is fine
