-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'm slightly confused as to the problem here. The identity of a lease if defined by the Client-ID and IAID, if those change then dnsmasq will allocate a new address. That means that your boot process will go through three different addresses, but should end up with a usable and stable address. It's not as if there is a shortage of IPv6 addresses, you can afford a couple of disposable addresses that only get used during the boot.
What have I missed? Cheers, Simon. On 27/02/17 16:04, Derek Higgins wrote: > I've recently been trying to use dnsmasq IPv6 to network boot, > after a number of hurdles the last problem I've been having is that > during the boot process (after dnsmasq initially hands out an IP > address as part of PXE boot), it starts responding with "no > addresses available". > > The problem I'm hitting is that the IAID and the ClientID in the > dhcp request changes during the process, - the IAID being used in > PXE generated by the OVMF UEFI firmware is a function including a > time based seed[1] - this chain loads(in my case) to an iPXE image > that is using a crc of the mac address to generate the IAID[2], - > dhclient on the OS then uses the last 4 octets of the MAC address > for the IAID[3] > > I have similar problems with ClientID but I havn't looked into them > in as much detail > > check_address in dnsmasq/src/rfc3315.c is asserting that the ID's > can't change, and the only way I've gotten the boot process to > work locally is to comment out the checks in check_address > > As best I can see RFC 3315 does say that the IAID MUST remain > consistent across restarts of the DHCP client, but then recognizes > that "There may be no way for a client to maintain consistency of > the IAIDs if it does not have non-volatile storage and the > client's hardware configuration changes" > > Is there a way to allow these IDs to change? and if not should > this check be in dnsmasq? or would a patch to optionally disable > the check be acceptable? > > thanks, Derek. > > > [1] - > https://github.com/tianocore/edk2/blob/418373a1cd97abc0c0e3557f7a00105 291829e6f/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c#L866 > > [2] - https://github.com/qemu/ipxe/blob/c34d151/src/net/udp/dhcpv6.c#L97 2 > [3] - > https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=blob;f=client/d hc6.c;h=be604ac988a983b2829f76fe2bff6a5f036d8019;hb=HEAD#l1716 > > _______________________________________________ Dnsmasq-discuss > mailing list Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss > -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBCAAGBQJYtJ9GAAoJEBXN2mrhkTWiXAwP/RZ+BE+gchcHXwz/wsGmz2gV QyHEop+9EZU2FPDBycp0bSBsPeM02Z5ZRfuVslqk/mPZke1WDFqp88Xo5m2wTi09 SIPhk8P8ONAgYcxWy8SYUTPzYWFxTx6R7xyjZaM/gUbBYlzqvCf4KFNDrHsIw9eg M+5M/pSvLHdA2ELAl1OaGgdC8UWgRIRKoBriSkcl17FwmT7UeLzWVB64NOxYxxGl pxLjqZVOymfuY5XbjN6DMs431Z/sGIwsY8SBRWU8y1Sm++/Gb55JEYydu1+KXEyW gx9yrdMH43D6uHp8g+o0C+xTWtoddJx93CwOHLeSRughe24f13Z3xsKbUQRycZRa UJPKOHSmkO38e6tbGqAMDFtsmoXwXRBElYls32TcS1ai/YzSvkcapKYZh6oiX83Z fo4+Iklyb87Dft5gj9TsBdr4A1C7Hf9W+A8FR8XL6V05/KT5Z9OS7UTH5vqGM+l/ 1bYQsHk7rnNwGrSUyI+QJDLfhjibwwlYs0IeTPhUqexSwRXDiRd0uLH1ZhmLHBRm 8T81sV4S7NErqp3daUdXJdK6GFSp7i8jDMHZujo9Wju9x7fGl2ROVW6oJqQX+lN2 v05zFaXePJR+78gEKVEQP38QNDYnKct8dVHRvoSb+B6pjAWuTM2HgsF0y+x0phNv JQQXY6kIaOIsjEDROC7q =oMah -----END PGP SIGNATURE----- _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss