>Number:         11102
>Category:       bin
>Synopsis:       <synopsis of the problem (one line>netbooted dhclient causes hang when moved to other subnet
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 29 17:22:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Tom Spindler
>Release:        <NetBSD-current source date> 13 Sep 2000
>Organization:
Redback Networks
	
>Environment:
	
System: NetBSD fartmangler.redback.com 1.5_ALPHA2 NetBSD 1.5_ALPHA2 (NETZUUL) #10: Fri Sep 15 15:34:13 PDT 2000 notroot@zuul.redback.com:/amd/netapp6/netbsd15/nbsrc/sys/arch/i386/compile/NETZUUL i386


>Description:
If you netboot a netbsd machine with root nfs mounted and use
dhclient to assign the address, dhclient will config your ether
iface address to be that it finds in /var/db/dhcpd.leases - before
it gets an ACK that it's the correct address to use. If you've
previously booted the machine on a different dhcp'ed subnet, the
lease will contain an address such that the default gateway becomes
unreachable - and your nfs mount of / will go away and cause the
boot to hang.
	
>How-To-Repeat:
Netboot netbsd machine with / on NFS on one subnet.
Reassign machine and address to different subnet. 
Boot hangs in dhclient because iface is mis-set and root goes away.
	
>Fix:
	
Fix: Don't change the enet iface's address until a succesful ACK from the DHCP
server.

Workaround: always delete /var/db/dhcpd.leases on reboot.
>Release-Note:
>Audit-Trail:
>Unformatted: