On Friday 02 November 2018 00:16:00 Pali Rohár wrote: > Hello, > > I'm trying to use iPXE on IPv6-enabled network. Everything is running > fine on this network, all IPv4 and IPv6 application, just iPXE has > problems. It cannot connect to any host which has both > > IPv6 router send RA packet without Autonomous bit (=disable SLAAC) and > with Managed and Other bits (= use DHCPv6 for IPv6 address assignment). > > Also on network is available standard IPv4 connection via DHCP. > > When iPXE is run on this network with enabled NET_PROTO_IPV6 then it > cannot connect to any host, just show error message: Network > unreachable. > > When iPXE is compiled without NET_PROTO_IPV6 then everything is working > fine and (IPv4) network is accessible. > > I guess that problem is in DNS resoling process. When host has more AAAA > and more A records, iPXE chose just first IPv6 one and fails when first > record is unreachable. Also in case no IPv6 address is assigned. And > when IPv4 network is functional it does not try to fallback. > > Same problem can be reproduced with Debian Stable version of qemu with > current git version of iPXE. > > Below is output for iPXE 133f4c47baef6002b2ccb4904a035cda2303c6e5 with > enabled NET_PROTO_IPV6: > > ======================================================================= > $ cd src > $ sed 's/#undef\tNET_PROTO_IPV6/#define\tNET_PROTO_IPV6/' -i config/general.h > $ make -j8 bin/rtl8139.rom > $ qemu-system-x86_64 -netdev user,id=n1 -device > rtl8139,netdev=n1,romfile=bin/rtl8139.rom -boot order=n -curses > > SeaBIOS (version 1.10.2-1) > > > iPXE (http://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+07F90DD0+07ED0DD0 CA00 > > > > Booting from ROM... > iPXE (PCI 00:03.0) starting execution...ok > iPXE initialising devices...ok > > > > iPXE 1.0.0+ (133f) -- Open Source Network Boot Firmware -- http://ipxe.org > Features: DNS HTTP iSCSI TFTP AoE ELF MBOOT PXE bzImage Menu PXEXT > > iPXE> dhcp > Configuring (net0 52:54:00:12:34:56)...... ok > iPXE> imgload http://boot.ipxe.org > http://boot.ipxe.org... Network unreachable (http://ipxe.org/280a6011) > iPXE> > ======================================================================= > > And below is output for iPXE when NET_PROTO_IPV6 is not enabled (without > that sed command recompiled): > > ======================================================================= > SeaBIOS (version 1.10.2-1) > > > iPXE (http://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+07F92DD0+07EF2DD0 CA00 > > > > Booting from ROM... > iPXE (PCI 00:03.0) starting execution...ok > iPXE initialising devices...ok > > > > iPXE 1.0.0+ (133f) -- Open Source Network Boot Firmware -- http://ipxe.org > Features: DNS HTTP iSCSI TFTP AoE ELF MBOOT PXE bzImage Menu PXEXT > > iPXE> dhcp > Configuring (net0 52:54:00:12:34:56)...... ok > iPXE> imgload http://boot.ipxe.org > http://boot.ipxe.org... ok > iPXE> > ======================================================================= > > So it can be clearly seen that problem is in iPXE's IPv6 implementation > as iPXE version without IPv6 is working fine as expected. > > Host boot.ipxe.org has both A and AAAA records, so even when IPv6 is > compiled, but not available (for any reason), IPv4 should work. > > Similar/same problem was reported for netboot.xyz project: > https://github.com/antonym/netboot.xyz/issues/283
Just reminder, that this problem is still present in the current git repository. Is there any progress? Or do you need some other details? I guess that above reproducer should be enough for debugging... -- Pali Rohár pali.ro...@gmail.com
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