dhcp option 81 from win98se breaks ddns on aix 4.3.3

dhcp option 81 from win98se breaks ddns on aix 4.3.3

Post by Sol Gongol » Sat, 16 Feb 2002 03:12:36

We have AIX 4.3.3 with dhcp/ddns/bind 8

Windows 98se sends FQDN option 81 with its dhcp request.
Microsoft has a fix to not send option 81 but we can't get/use it.

AIX dhcp doesn't recognize option 81, has a problem and
then ignores the option 15 specification in dhcpsd.cnf.

As a result, AIX dhcp doesn't know a domain name, passes it
as null to dhcpaction8 which invokes nslookup with a host name
but no domain name causing name resolution problems.
This is a sample line from from dhcpsd.log:
/usr/sbin/dhcpaction8 'SYSTEM1' '' '' '345600' BOTH NONIM

Quote:>>/tmp/updns.out 2>&

I am considering modifying dhcpaction8 to default to a domain if one is
not received but don't know enough about possible side effect. Would
be the right thing to do?

From dhcpaction8:
   if [ -n "$domainname" ]
   # machname="$hostname"                   # Original, don't use domain
if not supplied
     machname="$hostname"."domainname.com"  # NEW, use desired domain

Thank you

ADL Data Systems Inc
20 livingstone ave
Dobbs Ferry, NY 10522
phone: 914 591 1800   fax: 914 591 1818


1. Need workaround for broken WIN98SE dhcp client

WIN98SE does not accept DHCPOffers from the dhcp server that is across
a router.  Any clues on how I can configure my DHCPSERVER (ISC 2.0
Slackware 7.0) to overcome 98SE?

Other clients (win98 FE) across the same router are working fine.  Oh
and it's not the NIC in the 98SE PC.

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