Patch-ID# 105089-01
Keywords: Point Patch, DHCP in.dhcpd interfaces sparc IP fragmentation filter 
Synopsis: PC-Admin 2.0: IP fragmentation flags cause DHCP packet to be discarded
Date: Aug/21/97

Solaris Release: 2.4 2.5 2.5.1

SunOS Release: 5.4 5.5 5.5.1

Unbundled Product: PC-Admin

Unbundled Release: 2.0

Relevant Architectures: sparc

BugId's fixed with this patch: 1234753

Changes incorporated in this version: 

Patches accumulated and obsoleted by this patch: 

Patches which conflict with this patch: 

Patches required with this patch: 

Obsoleted by: 

Files included with this patch: 

   /opt/SUNWpcnet/sbin/in.dhcpd 

Problem Description: 

The PC-Admin version 2.0 is discontinued and not supported.
Amongst the bugs fixed for version 2.0 is the problem for escalation 510409.
This in.dhcpd did solve the customer problem and is here released for
that customer as a point patch.
 
in.dhcpd is filtering packets based on the criteria: "type = UDP and port = 67".  
This allows some fragmented UDP packets to slip through - namely those which have
a data value of 67 at the port offset.  This tends to happen fairly
frequently during periods of heavy NFS traffic, as NFS tends to
produce lots of fragmented UDP packets.


Patch Installation Instructions: 
-------------------------------- 
Refer to the Install.info file for instructions on using the
generic 'installpatch' and 'backoutpatch' scripts provided with
each patch.  Any other special or non-generic installation
instructions should be described below as special instructions.

Special Install Instructions: 
----------------------------- 

None.

Notes in regard to running dhcp server version 2.0
--------------------------------------------------
First let me explain how we made the new daemon running.
We found out that the daemon tries to search for files in the /etc/opt/SUNWpcnet directory, 
while the old daemon has his files in the /opt/SUNWpcnet/etc directory.
We had to set a link between the directories because the SNC scripts uses a 
different directory on /opt/SUNWpcnet.
Since the customer also uses the client manager from the PC, we had to set the link from 
the new directory to the old directory. (ln -s /opt/SUNWpcnet/etc /etc/opt/SUNWpcnet).
This had to be done because both the DHCP and the client manager uses the
nisupdate.LOCK file in /opt/SUNWpcnet/etc. The PC can't handle links over filesystems but 
the Sun can, so we had to set the link that way.


Additional information from the man pages
-----------------------------------------
...
    -d         Debugging mode. The daemon  remains  as  a  fore-
               ground  process,  and displays verbose messages as
               it processes DHCP and/or BOOTP datagrams. Messages
               are  displayed on the current TTY. This option can
               be used in both DHCP/BOOTP server mode  and  BOOTP
               relay agent mode.

     -e         Turn off Ethers  compatibility  mode.  Note  that
               ethers   compatibility   mode  only  functions  on
               servers configured to serve  as  BOOT  servers  to
               Solaris for PowerPC clients.

     -n         Disable automatic duplicate IP address detection.
               When  this  option  is  specified, the DHCP server
               will not attempt to verify that an IP  address  it
               is  about  to  offer  a  client  is not in use. By
               default, the  DHCP  server  pings  an  IP  address
               before offering it to a DHCP/BOOTP client, to ver-
               ify that the address is  not  in  use  by  another
               machine.
               
    -v         Verbose mode. The daemon displays  more  messages
               than  in  the default mode. Note that verbose mode
               can reduce daemon efficiency due to the time taken
               to display messages. Messages are displayed to the
               current TTY if the debugging option is used,  oth-
               erwise  messages  are logged to the syslogd facil-
               ity. This option can be used  in  both  DHCP/BOOTP
               server mode and BOOTP relay agent mode.
...