Public bug reported:
As far as I know, the dhcp standards do not allow for multiple
Domainnames to be set through Option 15. My LInksys router doesn't care,
though, and sends both the Domainname I gave it AND the Domainname my
ISP gives it. Maybe this is non-standard, but it is what it is.
isc-dhcp-client handles this in the worst possible way. It could choose
one name or the other, or it could ignore both names when it sees the
malfunction. Instead, it concatenates the names together, assuring that
it ends up with an invalid name.
>From the below excerpt of dhcpdump I would end up with the domain name
my.comhr.remote.com.
OPTION: 6 ( 4) DNS server 192.168.0.1
OPTION: 15 ( 6) Domainname my.com
OPTION: 15 ( 13) Domainname hr.remote.com
---------------------------------------------------------------------------
In the end this gives me an invalid domain in search in resolv.conf.
Ideally I'd end up with "search my.com hr.remote.com" there, but from
scanning the scripts I can see how that wouldn't really work. Still, the
concated domainname seems like a bad idea.
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1104675
Title:
Bad handling of multiple domainname options
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