On 13/03/2022 22:30, Evgeniy Berdnikov via Exim-users wrote: > On Sun, Mar 13, 2022 at 08:06:45PM +0000, Mike Tubby via Exim-users wrote:
>> 2022-03-13 19:47:53 1nTTGO-0001Jw-Tr H=alt2.gmail-smtp-in.l.google.com
>> [2a00:1450:4025:c03::1a]: SMTP timeout after sending data block (476909
>> bytes written): Connection timed out
> Looks like broken Path MTU discovery. Collect and post traffic dump here.
root@relay1:/etc/init.d# traceroute -6 alt2.gmail-smtp-in.l.google.com
traceroute to alt2.gmail-smtp-in.l.google.com (2a00:1450:4025:c03::1a),
30 hops max, 80 byte packets
1 bdi100-router-btnet.thorcom.net (2a00:2381:19c6::1) 0.432 ms 0.397
ms 0.378 ms
2 2a00:2380:3003:1000::19c4 (2a00:2380:3003:1000::19c4) 4.292 ms
5.643 ms 5.625 ms
3 * * *
4 peer8-et4-0-2.telehouse.ukcore.bt.net (2a00:2380:14::c1) 7.488 ms
peer3-et0-0-3.redbus.ukcore.bt.net (2a00:2380:c::383) 7.599 ms
peer7-et4-1-3.telehouse.ukcore.bt.net (2a00:2380:c::391) 7.867 ms
5 2a00:2380:2001:8000::17 (2a00:2380:2001:8000::17) 9.621 ms
2a00:2380:2010:3000::27 (2a00:2380:2010:3000::27) 8.213 ms
2a00:2380:2001:7000::19 (2a00:2380:2001:7000::19) 9.473 ms
6 2a00:1450:8166::1 (2a00:1450:8166::1) 8.178 ms 2a00:1450:80ff::1
(2a00:1450:80ff::1) 9.822 ms 2a00:1450:8125::1 (2a00:1450:8125::1)
8.291 ms
7 2001:4860:0:1::2fd6 (2001:4860:0:1::2fd6) 8.641 ms
2001:4860:0:1::248a (2001:4860:0:1::248a) 7.549 ms 2001:4860:0:1::2fd8
(2001:4860:0:1::2fd8) 9.467 ms
8 2001:4860:0:135d::12 (2001:4860:0:135d::12) 8.734 ms * *
9 2001:4860::c:4000:dd7a (2001:4860::c:4000:dd7a) 8.744 ms
2001:4860::c:4002:1122 (2001:4860::c:4002:1122) 26.100 ms *
10 2001:4860::c:4002:c2cf (2001:4860::c:4002:c2cf) 25.931 ms
2001:4860::c:4002:c2ce (2001:4860::c:4002:c2ce) 15.045 ms
2001:4860::c:4002:c234 (2001:4860::c:4002:c234) 14.163 ms
11 2001:4860::c:4001:5c5 (2001:4860::c:4001:5c5) 17.300 ms 17.226 ms
2001:4860::c:4001:5c4 (2001:4860::c:4001:5c4) 16.772 ms
12 2001:4860::c:4001:ec6 (2001:4860::c:4001:ec6) 21.189 ms
2001:4860::c:4001:ebe (2001:4860::c:4001:ebe) 26.065 ms
2001:4860::c:4001:ebf (2001:4860::c:4001:ebf) 21.253 ms
13 2001:4860::c:4002:806 (2001:4860::c:4002:806) 25.670 ms 25.629 ms
2001:4860::c:4002:808 (2001:4860::c:4002:808) 26.293 ms
14 2001:4860::cc:4002:115e (2001:4860::cc:4002:115e) 24.767 ms
2001:4860::cc:4002:115f (2001:4860::cc:4002:115f) 24.966 ms
2001:4860::cc:4002:115e (2001:4860::cc:4002:115e) 25.260 ms
15 * * 2001:4860:0:1::3c37 (2001:4860:0:1::3c37) 25.039 ms
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * rc-in-f26.1e100.net (2a00:1450:4025:c03::1a) 24.759 ms
root@relay1:/etc/init.d#
root@relay1:/etc/init.d# tracepath -6 -b alt2.gmail-smtp-in.l.google.com
1?: [LOCALHOST] 0.013ms pmtu 1500
1: bdi100-router-btnet.thorcom.net (2a00:2381:19c6::1) 0.528ms
1: bdi100-router-btnet.thorcom.net (2a00:2381:19c6::1) 0.501ms
2: 2a00:2380:3003:1000::19c4 (2a00:2380:3003:1000::19c4) 4.467ms
3: core1-hu0-8-0-0.southbank.ukcore.bt.net (2a00:2380:14::ea) 7.934ms
4: peer2-et3-1-7.slough.ukcore.bt.net (2a00:2380:c::3fd) 11.214ms
asymm 5
5: 2a00:2380:2001:8000::1f (2a00:2380:2001:8000::1f) 9.646ms asymm 9
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Too many hops: pmtu 1500
Resume: pmtu 1500
root@relay1:/etc/init.d#
