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Yep, i'm no expert, but a BGP looking glass seems to suggest that all of the best paths (chosen by AS pathlength?) are not being advertised to peers... But some routes are being advertised? Idk Router: Palo Alto, CA - US
Command: show ip bgp 104.244.42.193
BGP routing table entry for 104.244.42.0/24
Versions:
Process bRIB/RIB SendTblVer
Speaker 261897778 261897778
Last Modified: Nov 7 06:11:36.675 for 00:02:37
Paths: (4 available, best #3)
Advertised to update-groups (with more than one peer):
0.2 0.3 0.6 0.7
Advertised to peers (in unique update groups):
129.250.47.126 129.250.9.146 128.242.180.62 80.150.168.193
128.241.2.58
Path #1: Received by speaker 0
Not advertised to any peer
13414 13414
116.51.31.10 (metric 14530) from 129.250.0.18 (129.250.0.18)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1405 2914:2406 2914:3400 65400:4134 65420:4134 65460:4134
Path #2: Received by speaker 0
Not advertised to any peer
13414 13414
62.73.183.110 (metric 28640) from 129.250.0.30 (129.250.0.30)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1204 2914:2205 2914:3200 65400:4134 65420:4134 65460:4134
Path #3: Received by speaker 0
Advertised to update-groups (with more than one peer):
0.2 0.3 0.6 0.7
Advertised to peers (in unique update groups):
129.250.47.126 129.250.9.146 128.242.180.62 80.150.168.193
128.241.2.58
13414 13414
129.250.195.210 (metric 7029) from 129.250.0.115 (129.250.0.167)
Origin IGP, localpref 120, valid, confed-internal, best, group-best
Received Path ID 0, Local Path ID 1, version 261897778
Community: 2914:370 2914:1007 2914:2000 2914:3000 65400:4134 65420:4134 65460:4134
Originator: 129.250.0.167, Cluster list: 0.0.0.6
Path #4: Received by speaker 0
Not advertised to any peer
13414 13414
129.250.195.210 (metric 7029) from 129.250.0.116 (129.250.0.167)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1007 2914:2000 2914:3000 65400:4134 65420:4134 65460:4134
Originator: 129.250.0.167, Cluster list: 0.0.0.6
edit: sorry about formatting, i've tried to clean it up. |
Update 1:
Looks like their networks are not announced anymore. From 4 providers, we don't see any network matching 104.244.42.1, 104.244.42.65, 104.244.42.129 or 104.244.42.193 (A records for twitter.com)
Update 2:
show ip bgp 104.244.42.0/24 % Network not in table No routes present...
Update 3: (3 mins ago)
Networks are back now, but quite some packet loss. Also, Comcast in norcal goes via Level3 to Twitter in London. They are also announcing direct to NTT which seems to get served locally. So, they're not quite out of the woods yet.