[Bug 1868065] Re: [Net Boot] Ubuntu server 18.04.4 failed to diskless boot via IPv6 iSCSI

[AndyLiang]

We verified on the DL360 Gen10 plus and Apollo 4200 Gen10 Plus with
onboard Intel NIC. The SUT installed OS is from the ubuntu-18.04.4
-server-amd64.iso. Since the OS is not able to boot, there is no info
for the "uname -a" command.

Actually, I don't think the command can fix the issue because the
problem causes by the OS tried the IPV4 first during the boot. The OS in
the iSCSI disk needs a proper setting to recognize the IPV6 before the
iscsistart process started.

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Title:
  [Net Boot] Ubuntu server 18.04.4 failed to diskless boot  via IPv6
  iSCSI

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  ISO: ubuntu-18.04.4-server-amd64.iso
  System environment: two ports connected to the network. The first port connects with IPv4 DHCP server. The second port connects with IPv4 and IPv6 DHCP server. 

  After installation completed through the 2nd NIC port, the system
  failed to boot via the remote IPv6 iSCSI disk. The system hangs on the
  "iscsistart: cannot make a connection to 0.0.7.209:0 (-1,101)". There
  are possible problems.

  The iscsistart uses the wrong port, the 1st port, to connect the iSCSI
  service. After adding the parameter ip=:::::eno1:off, the iscsistart
  uses the 2nd port to connect but still with IPv4 address. Adding the
  other parameters, ip=:::::eno2:off ip6=eno2, the iscsistart gets the
  IP, 0.0.0.0 on eno2 to connect the service. The eno2 gets the IPv6
  address after the iscsistart connection.

  The iscsistart also can't recognize the IPv6 address. The log shows
  "Logging into iqn.2100-01.xx.xxx:ubuntu 2001:0,1". The parameters,
  rd.iscsi.firmware=1 or rd.iscsi.target.ip=[2001:db8:feed::100], have
  no effect.

  Please help

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