[Bug 1785768] Re: [bionic] net-installer dhcp client fails with DHCPDECLINE

[Simon]

I'm definitely seeing this bug at the moment, my issue arises when i
have multiple router options , for example in isc-dhcp.

option routers 192.168.0.254, 192.168.0.253;

this is causing the client to send back a DHCPDECLINE. If i just have
one router defined everything seems to work ok. The DNS settings don't
seem to have an effect for me anyway even if i provide an unreachable
address in the DHCP server config it still works it only stops when
there are multiple routers presented.

I tried patching  netcfg with the patch from
https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/848072 but this
didn't help the issue. At the moment I'm doing something like this

 if exists user-class and option user-class = "iPXE" {
        filename "boot.ipxe";
        option routers 192.168.0.254, 192.168.0.253;
  }
  elsif option vendor-class-identifier = "d-i" {
        option routers 192.168.0.254;
  } else {
        option routers 192.168.0.254, 192.168.0.253;
        filename "undionly.kpxe";
  }

The netboot environment sends a "d-i" as the vendor-class-identifier so
if i only provide one router at this point the net install continues.

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https://bugs.launchpad.net/bugs/1785768

Title:
  [bionic] net-installer dhcp client fails with DHCPDECLINE

Status in netcfg package in Ubuntu:
  New

Bug description:
  During installation over PXE with a preseed file and with the netboot
  files the dhcp client fails with a DHCPDECLINE. Apparently it's a
  known issue which is often reiterated between each version according
  to this bugreport :
  https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/848072

  The client machine start over PXE and get with success all files which
  are needed to start the debian-installer. While it tries to configure
  the network the client sends a DHCPDECLINE and the network
  configuration fails.

  I have downloaded netboot.tar.gz file from this link :

  http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-
  amd64/current/images/netboot/netboot.tar.gz

  Ubuntu version:  18.04
  Installer build: 20101020ubuntu543

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