Date: Thu, 16 Jan 2020 23:07:45 +0700 From: Victor Sudakov <vas@sibptus.ru> To: Eugene Grosbein <eugen@grosbein.net> Cc: freebsd-net@freebsd.org, "Andrey V. Elsukov" <bu7cher@yandex.ru>, Michael Tuexen <tuexen@freebsd.org> Subject: Re: IPSec transport mode, mtu, fragmentation... Message-ID: <20200116160745.GA1356@admin.sibptus.ru> In-Reply-To: <55f7bafa-24c4-9810-0d21-f82cb332ee2d@grosbein.net> References: <20191220152314.GA55278@admin.sibptus.ru> <4cc83b85-dd30-8c0d-330e-aa549ce98c98@yandex.ru> <f9b7357e-ced1-4ce5-40d5-8e3dcad42442@yandex.ru> <d263a709-63cf-7da5-1747-8a6791f6503f@grosbein.net> <20200116155305.GA465@admin.sibptus.ru> <55f7bafa-24c4-9810-0d21-f82cb332ee2d@grosbein.net>
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--82I3+IH0IqGh5yIs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Eugene Grosbein wrote: >=20 > > What beats me is that I cannot reproduce this problem in bhyve. In this > > packet dump: http://admin.sibptus.ru/~vas/ipsec1.pcap.gz I'm scp-ing a > > 50M file from 192.168.246.10 (bhyve guest) to 192.168.246.1 (bhyve > > host), and I see no fragments, and the largets packet is 1466 bytes, and > > the scp never stalls nor fails. > >=20 > > Why is it NOT broken this time? > >=20 > > Both hosts are 12.1-RELEASE-p1. >=20 > I could not reproduce the problem with unpatched recent stable/11, either= :-) Is there a way to view the MSS in the TCP segments before encryption or after decryption? I want to compare them in situations with IPSec enabled and disabled. I've never been able to see anything in "tcpdump -i enc0", probably it cannot do transport mode IPSec because the man page talks about "outer and inner header." --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/ --82I3+IH0IqGh5yIs Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJeIIpRAAoJEA2k8lmbXsY04SwIAKsORwXhKl8DLH9MpRduWbyt 032Y5dxP+yMedCWQGJDSVg907WyGXJ3Gs8FsnGf1TPQfprNn9S+IpC9KjH1QwaB9 njC3Cie7mIRIosM5RUymgRtV4AIQqB2t1ifIv54ogkeukNyXYIk+Hrrm7L4+jtDu NncKCpa9dgwaM/gNroSsLSdszVnXFbp4YS3qBSUqv1jVEnjqDw4kKpRs4cA0wZv2 cCqSViGU2D9W3s8u/ueXntDuivTNXGVLENf604hvQCIxfUuavcuE7MDEPO1ffISY CCn7EKsEWjXp5iYNq5uggQ7bN+I4ZC9mmxULXtZtI2A17WJou26jnqDGE945Vrw= =xff3 -----END PGP SIGNATURE----- --82I3+IH0IqGh5yIs--
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