ЗаТелеком
http://ping-admin.ru/free_test/result/1646931718e0jhrzbk103ggx1bw6388r.html
Где-то заблокирован на уровне маршрутизации (ICMP no route to host), где-то — на DPI (TCP RST).
На серверном подключении, где никогда блокировок не было никаких совсем, домен недоступен через УГМК-телеком → Ростелеком (последний хоп — 188.254.25.77), но доступен через Goodline (E-Light).
TTK Looking Glass показывает BGP-маршрут /32 на IP-адрес 173.37.145.8:
Router: mskn13ra
Command: show bgp 173.37.145.8
Thu Mar 10 17:27:51.584 UTC
BGP routing table entry for 173.37.145.8/32, Route Distinguisher: 20485:1
Versions:
Process bRIB/RIB SendTblVer
Speaker 402948510 402948510
Last Modified: Jan 17 21:56:13.803 for 2y07w
Paths: (2 available, best #1)
Not advertised to any peer
Path #1: Received by speaker 0
Not advertised to any peer
10.146.0.1 (metric 1846) from 10.78.0.71 (10.146.0.1)
Received Label 24001
Origin incomplete, metric 0, localpref 100, valid, internal, best, group-best, import-candidate, imported
Received Path ID 0, Local Path ID 1, version 402948510
Community: 20485:6108
Extended community: RT:20485:1
Originator: 10.146.0.1, Cluster list: 10.78.0.71, 10.149.0.31
Source AFI: VPNv4 Unicast, Source VRF: internet, Source Route Distinguisher: 20485:1
Path #2: Received by speaker 0
Not advertised to any peer
10.146.0.1 (metric 1846) from 10.99.0.41 (10.146.0.1)
Received Label 24001
Origin incomplete, metric 0, localpref 100, valid, internal, import-candidate, imported
Received Path ID 0, Local Path ID 0, version 0
Community: 20485:6108
Extended community: RT:20485:1
Originator: 10.146.0.1, Cluster list: 10.78.0.71, 10.149.0.31
Source AFI: VPNv4 Unicast, Source VRF: internet, Source Route Distinguisher: 20485:1
Traceroute выдаёт блокировку:
Router: mskn13ra
Command: traceroute 173.37.145.8
Thu Mar 10 17:29:32.638 UTC
Tracing the route to 173.37.145.8
1 10.99.99.129 24 msec 18 msec 17 msec
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
В то же время на маршрутизаторах RETN blackhole’а нет, сервис доступен:
Router: Query:
RT.KNX.OMS.RU.retn.net traceroute monitor summary inet 173.37.145.8
HOST: RT.OMS.RU Loss% Snt Last Avg Best Wrst StDev
1. ae1-1.RT.TC1.STO.SE.retn.net 0.0% 10 53.7 58.6 53.5 64.8 4.4
2. 10gigabitethernet1-2.core1.s 0.0% 10 55.9 56.9 55.8 61.7 1.8
3. 100ge0-35.core2.cph1.he.net 90.0% 10 64.2 64.2 64.2 64.2 0.0
4. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
5. 100ge0-56.core3.ash1.he.net 30.0% 10 149.4 157.3 148.4 203.6 20.4
6. 100ge1-2.core1.ash1.he.net 0.0% 10 154.6 157.2 154.0 169.9 5.6
7. port-channel13.core2.atl1.he 20.0% 10 174.7 173.8 167.1 188.2 7.4
8. 100ge14-1.core1.dal1.he.net 0.0% 10 186.6 187.0 184.1 205.9 6.7
9. cisco-systems.10gigabitether 0.0% 10 182.9 183.3 179.5 209.0 9.1
10. 128.107.4.9 0.0% 10 189.5 189.6 186.0 211.0 7.6
11. alln01-mda2-dmzbb-gw2-be92.c 0.0% 10 189.7 200.0 186.9 250.1 19.4
12. alln01-mda2-dmzdcc-gw2-por2. 0.0% 10 187.6 192.8 186.7 218.5 11.3
13. alln01-mda1-fab1-sw3811-dmzd 0.0% 10 182.6 191.8 182.6 220.0 13.0
14. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
15. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
16. hsrp-173-37-145-1.cisco.com 0.0% 10 187.9 195.0 187.8 233.8 15.3
17. tools2.cisco.com 0.0% 10 181.8 187.0 181.6 229.1 14.8