Date: Mon, 22 Apr 2024 07:59:48 +0200 From: Gerrit =?UTF-8?B?S8O8aG4=?= <gerrit.kuehn@aei.mpg.de> To: Dag-Erling =?UTF-8?B?U23DuHJncmF2?= <des@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: possible regression handling packet fragmentation in 14.0 with tftp/pxe Message-ID: <20240422075948.5bb856ac@arc.aei.uni-hannover.de> In-Reply-To: <86y1999wwe.fsf@ltc.des.dev> References: <20240419153951.5a23ce5f@arc.aei.uni-hannover.de> <86y1999wwe.fsf@ltc.des.dev>
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--Sig_/Gdv=.qnOy7tmj3EMLUFINuV Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Am Fri, 19 Apr 2024 17:48:01 +0200 schrieb Dag-Erling Sm=C3=B8rgrav <des@FreeBSD.org>: > Since you control the routers and endpoints, I would suggest running > tcpdump at various points to see what is the tunnel and pf are doing to > the UDP packets. They are presumably getting fragmented at some point, > and hopefully reassembled somewhere else. Yes, I can acces all tap, bridge, and ethernet interfaces along the way (well, apart from what the pxe client actually receives, this is hidden in its firmware). However, I already did that last week but was not able to spot the culprit (the packet being sent back to the pxe client machine is 1460 bytes, so it looks complete to me but is obviously not accepted on the client's end). I'll probably have to read up more on tcpdump and fragmentation handling first to get a better understanding of what I am actually looking for. Any idea what the "bad length 1460 > 1392" message on the 13.3 system means (and why everything is still working)? > Meanwhile you can also set the net.inet.udp.maxdgram sysctl to 1425 on > the NFS server, as tftpd will cap the blocksize to that value. That's an interesting hint I didn't see before. thanks. As the server is used by a bunch of systems and the "-o" option works around the issue for me right now, I will probably refrain from toying with the setting on the production system and see if I can come up with a separate test setup instead. I am working on a new server machine that will come with a migration from syslinux/mbr to ipxe/uefi and thus reduce the usage of tftp (it will only be used for the first ipxe firmware/bootloader step then - bootmenu, kernel and initramfs will be transferred over http). This might give me a good test environment where I can try things without breaking the production system. As this appears to be different behaviour on 13.3 and 14.0, I had hoped this might already be sufficient to ring a bell for someone here reading this (like "oh, yes, there were changes in pf that cause different handling of fragmented udp packets"). I hope I can soon dig up more information. cu Gerrit --Sig_/Gdv=.qnOy7tmj3EMLUFINuV Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgIFADCABgkqhkiG9w0B BwEAAKCCF/QwggQyMIIDGqADAgECAgEBMA0GCSqGSIb3DQEBBQUAMHsxCzAJBgNV BAYTAkdCMRswGQYDVQQIDBJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcMB1Nh bGZvcmQxGjAYBgNVBAoMEUNvbW9kbyBDQSBMaW1pdGVkMSEwHwYDVQQDDBhBQUEg Q2VydGlmaWNhdGUgU2VydmljZXMwHhcNMDQwMTAxMDAwMDAwWhcNMjgxMjMxMjM1 OTU5WjB7MQswCQYDVQQGEwJHQjEbMBkGA1UECAwSR3JlYXRlciBNYW5jaGVzdGVy MRAwDgYDVQQHDAdTYWxmb3JkMRowGAYDVQQKDBFDb21vZG8gQ0EgTGltaXRlZDEh MB8GA1UEAwwYQUFBIENlcnRpZmljYXRlIFNlcnZpY2VzMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAvkCd9G7h6naHHE1FRI6+RsiDBp3BKv4YH47kAvrz q11QihYxC5oG0MVwIs1JLVRjzLZuaEYLU+rLTCTAvHJO6vEVrvRUmhIKw3qyM2Di 2olV8yJY897cz++DhqKMlE+faPKYkEaEJ8d2v+PMNSyLXgdkZYLASLCokflhn3Yg 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