** Description changed: + [ Impact ] + + This bug affects IPv6 only networks in combination with booting from + iSCSI Boot Firmware Table (iBFT). In those setups, there is no DHCPv4 + available. The initramfs will only try DHCPv4 and run into a timeout. + + [ Test Plan ] + + This setup was distilled down to test cases and the new qemu-net-iscsi + autopkgtest was added. + + The test plan is to check that all autopkgtest were successful. In + addition testing this version in a cloud environment is possible. + + [ Where problems could occur ] + + The newly added code only increases the initrd by some bytes. The + changed code is around the network configuration in the initrd and can + influence network boot with iSCSI. Users with IPv6 in iBFT might still + want to have IPv4 configured. That should be done by the network daemon + of the installed system. + + [ Original report ] + iSCSI Boot Firmware Table (iBFT) can provide the network configuration that is needed to boot over iSCSI. The iBFT can contain IPv4 or IPv6 addresses. local-top/iscsi calls `configure_networking`. The default behaviour of `configure_networking` is DHCPv4 on all available interfaces (if ip= and ip6= are not set). If iBFT provides IPv6 addresses and no DHCPv4 server are running, `configure_networking` will only try DHCPv4 and run into a timeout. Placing the single line "ISCSI_AUTO=true" into /etc/iscsi/iscsi.initramfs, or use the kernel boot line option "iscsi_auto" will configure the network devices based on iBFT, but the code in `local-top/iscsi` will assume that the addresses are IPv4. dracut on the other hand has the kernel boot line parameters `rd.iscsi.firmware=1` and `rd.iscsi.ibft` and `ibft` as option for the `ip` parameter. The `ibft` option is a bit under documented. https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/installation_guide/chap- anaconda-boot-options mentions `ip=ibft` and dracut.cmdline mentions it. There are multiple ways to address the timeout with IPv6 iBFT: 1) Extend `local-top/iscsi` to differentiate between IPv4 and IPv6 when "iscsi_auto" is used. This information needs to be passed to `configure_networking` to only try to bring up that device and protocol. 2) Use `ip=ibft` as indicator to use ibft as source for the network configuration. If no ip= parameter is set, local-top/iscsi should default to ip=ibft when calling configure_networking. Both solutions require passing data to configure_networking. Requiring the user to set `ip=off ip6=on` is not a good user experience and not a solution in my opinion.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2091904 Title: IPv6 iBFT boot runs into a timeout To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2091904/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
