On 04/07/17 18:00, Patrick O'Callaghan wrote:
> I'm wondering if this could be related to MTU issues, which in the past
> have sometimes caused very mysterious behaviour. Not sure how to check
> though. Maybe use tracepath (not traceroute), or ping with different
> size packets might show something.


I do not know....  But another possibility (thinking about another
thread)....

[root@meimei enp2s0]# host docs.python.org
docs.python.org is an alias for python.map.fastly.net.
python.map.fastly.net has address 151.101.0.223
python.map.fastly.net has address 151.101.192.223
python.map.fastly.net has address 151.101.64.223
python.map.fastly.net has address 151.101.128.223
python.map.fastly.net has IPv6 address 2a04:4e42::223
python.map.fastly.net has IPv6 address 2a04:4e42:200::223
python.map.fastly.net has IPv6 address 2a04:4e42:400::223
python.map.fastly.net has IPv6 address 2a04:4e42:600::223

So that host has 4 IPv4 and 4 IPv6 addresses.

Probably a long shot, but if the system isn't configured properly for
IPv6 it may explain why it works sometimes and not others. 

In looking at wireshark earlier trying to see what a re-transmitted
packet would be displayed I found my system seems to prefer IPv6 for
that particular host.  :-)

Not sure what good tracepath would be since....

[root@meimei enp2s0]# tracepath -n 151.101.192.223
 1?: [LOCALHOST]                      pmtu 1500
 1:  192.168.1.1                                           0.577ms
 1:  192.168.1.1                                           0.560ms
 2:  211.75.128.254                                        9.495ms
 3:  168.95.229.46                                         9.464ms
 4:  220.128.4.102                                        10.177ms asymm  6
 5:  220.128.1.182                                        16.220ms asymm  6
 6:  220.128.4.21                                         31.501ms
 7:  211.22.33.53                                         34.772ms asymm  9
 8:  61.14.157.82                                         38.363ms asymm  9
 9:  61.14.157.78                                         74.545ms asymm 13
10:  61.14.158.41                                         70.767ms asymm 12
11:  61.14.158.41                                         66.320ms asymm 12
12:  no reply
13:  no reply
14:  no reply

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