On 11/05/22 20:46, Nathan Ward wrote:
On 11/05/2022, at 8:06 PM, Richard Hector wrote:
Hi all,
Hopefully this is acceptable here ...
I have a VPS (with a well-known NZ provider) which I can ping, but can't ssh
to. tcptraceroute stops a couple of hops in (I think the first to not respond
is our immediate ISP's immediate upstream).
From a different house/ISP, I can connect fine, and from here, I can connect to
a different VPS (same provider, different network block)
I'm reasonably confident it's not firewall, partly from extensive testing, and
partly because the same behaviour is shown when running tcptraceroute to the
gateways of the respective VPS.
Any thoughts?
The fact that the traces make it part way suggest to me that it's a routing
problem, but then how does ping work?
I could include tcptraceroute results, but is it considered ok to reveal ISPs
etc? My email probably reveals it all anyway, of course ... :-)
Yeah post away. I would suggest run mtr once with tcp, once with udp, once with
icmp.
mtr has tcp, udp and icmp modes these days and I find it better than
traditional tcptraceroute - if for no other reason than it’s got a nice
consistent interface regardless what protocol you’re testing with.
It may be that the hop that tcptraceroute “stop” at is actually just a router
that’s dropping your tcp from hitting the control plane, and higher TTL packets
continue through, so let them run their course and see if you get hops after
that.
Probably also be worth hitting up your ISP, if that’s relevant, as it sounds
like it’s an issue with them.
Thanks Nathan.
From home (2degrees):
richard@citrine:~$ mtr -tr 103.6.212.12
Start: 2022-05-11T20:59:07+1200
HOST: citrine Loss% Snt Last Avg Best Wrst StDev
1.|-- void.home 0.0%100.5 0.5 0.4 0.7
0.1
2.|-- 65.7.69.111.static.snap.n 0.0%103.3 3.5 1.5 8.6
2.3
3.|-- voyager.wix.nzix.net 0.0%102.2 2.5 2.0 3.5
0.6
4.|-- ae-0-447.cr2.wgn.vygr.net 0.0%102.7 2.8 2.1 4.2
0.7
5.|-- xe-2-0-3-0.cr1.wgn.vygr.n 0.0%104.0 2.8 2.0 4.6
0.8
6.|-- xe-1-1-0-0.cr2.mdr.vygr.n 0.0%10 13.4 12.5 11.9 13.4
0.5
7.|-- ae-1-0.cr1.mdr.vygr.net0.0%10 12.4 12.9 11.8 15.3
1.2
8.|-- et-0-0-0-0.cr1.qst.vygr.n 0.0%10 12.7 15.0 11.8 34.0
6.7
9.|-- et-0-0-3-0.cr2.qst.vygr.n 0.0%10 14.1 14.2 11.7 21.1
3.5
10.|-- et-0-0.3.cr2.qst.vygr.net 0.0%10 14.6 12.6 11.7 14.6
0.9
11.|-- xe-0-1-0.cr2.pmd.vygr.net 0.0%10 13.1 15.2 12.0 37.9
8.0
12.|-- 113.21.224.23 0.0%10 12.3 12.5 12.2 13.3
0.4
13.|-- akl-host1.backend.net.nz 0.0%10 13.3 14.0 12.1 22.5
3.1
richard@citrine:~$ mtr -trT 103.6.212.12
Start: 2022-05-11T21:00:58+1200
HOST: citrine Loss% Snt Last Avg Best Wrst StDev
1.|-- void.home 0.0%100.5 0.6 0.5 0.7
0.0
2.|-- 65.7.69.111.static.snap.n 0.0%10 32.1 5.8 2.1 32.1
9.3
3.|-- ??? 100.0100.0 0.0 0.0 0.0
0.0
richard@citrine:~$ mtr -tru 103.6.212.12
Start: 2022-05-11T21:01:25+1200
HOST: citrine Loss% Snt Last Avg Best Wrst StDev
1.|-- void.home 0.0%100.5 0.5 0.5 0.7
0.1
2.|-- 65.7.69.111.static.snap.n 0.0%102.0 2.1 1.6 3.4
0.6
3.|-- ??? 100.0100.0 0.0 0.0 0.0
0.0
From a different home (Spark):
richard@kereru:~$ mtr -tr 103.6.212.12
Start: 2022-05-11T21:04:56+1200
HOST: kereru Loss% Snt Last Avg Best Wrst StDev
1.|-- fibre-router 0.0%100.6 0.5 0.4 0.6
0.1
2.|-- 219-88-156-1-vdsl.sparkbb 0.0%107.9 4.0 1.7 7.9
1.7
3.|-- ??? 100.0100.0 0.0 0.0 0.0
0.0
4.|-- 122.56.113.6 0.0%10 12.7 12.1 10.7 13.7
1.0
5.|-- voyager-dom.akcr11.global 0.0%10 13.7 14.7 11.5 28.7
5.1
6.|-- et-0-0-0-0.cr1.qst.vygr.n 0.0%10 14.8 16.0 11.7 22.6
3.7
7.|-- et-0-0-3-0.cr2.qst.vygr.n 0.0%10 12.0 13.5 11.0 18.8
2.3
8.|-- et-0-0.3.cr2.qst.vygr.net 0.0%10 27.6 15.6 11.4 27.6
4.5
9.|-- xe-0-1-0.cr2.pmd.vygr.net 0.0%10 14.3 14.5 11.4 21.3
2.7
10.|-- 113.21.224.23 0.0%10 14.3 13.7 11.7 15.2
1.3
11.|-- akl-host1.backend.net.nz 0.0%10 11.2 12.9 11.2 15.2
1.4
richard@kereru:~$ mtr -trT 103.6.212.12
Start: 2022-05-11T21:06:04+1200
HOST: kereru Loss% Snt Last Avg Best Wrst StDev
1.|-- fibre-router 0.0%100.6 0.7 0.6 1.3
0.2
2.|-- 219-88-156-1-vdsl.sparkbb 0.0%104.0 4.3 1.9 8.8
2.0
3.|-- ??? 100.0100.0 0.0 0.0 0.0
0.0
