RE: DHCP Event ID 1053

From: Shilpa Sinha [MSFT] (v-shilsi_at_online.microsoft.com)
Date: 06/09/04


Date: Wed, 09 Jun 2004 01:56:56 GMT

Hi

Is BOOTP enabled?
Maybe this will help

Problem:
========
event id 1053 "The DHCP/BINL Service on this Small Business Server has
encountered another Server on this network with IP Address, 192.168.70.1,
belonging to the Domain:"

Resolution:
==========
CAUSE:
======

This can occur if the BOOTP relay agent forwards the DHCP Offer frame from
the DHCP
server to the broadcast address (255.255.255.255) instead of forwarding the
Offer
frame directly to the client computer that requested the IP address. The
DHCP
server sees this traffic and interprets it as another DHCP server on the
same
network, which causes the DhcpServer service to fail.

A network monitor capture of this DHCP traffic will show a pattern similar
to the
following:

Frame 1 (Discover frame forwarded from the BOOTP relay agent to the DHCP
server):

DHCP Discover Source: Cisco router Destination: SBS server
Frame: Base frame properties
ETHERNET: ETYPE = 0x0800 : Protocol = IP: DOD Internet Protocol
IP: ID = 0x2543; Proto = UDP; Len: 272
UDP: Src Port: BOOTP Server, (67); Dst Port: BOOTP Server (67); Length =
252
(0xFC)
DHCP: Discover (xid=00000000)

Frame 2 (Offer frame from the DHCP server back to the BOOTP relay agent):

DHCP Offer Source: SBS server Destination: Cisco router
Frame: Base frame properties
ETHERNET: ETYPE = 0x0800 : Protocol = IP: DOD Internet Protocol
IP: ID = 0x63A3; Proto = UDP; Len: 328
UDP: Src Port: BOOTP Server, (67); Dst Port: BOOTP Server (67); Length =
308
(0x134)
DHCP: Offer (xid=00000000)

Frame 3 (Offer frame from the BOOTP relay agent to the broadcast address):

DHCP Offer Source: Cisco router Destination: 255.255.255.255
Frame: Base frame properties
ETHERNET: ETYPE = 0x0800 : Protocol = IP: DOD Internet Protocol
IP: ID = 0x2544; Proto = UDP; Len: 328
UDP: IP Multicast: Src Port: BOOTP Server, (67); Dst Port: BOOTP Client
(68);
Length = 308 (0x134)
DHCP: Offer (xid=00000000)

The DHCP server interprets Frame 3 from the BOOTP relay agent to the
broadcast
address as an offer from another DHCP server on the network, which causes
the DhcpServer service to fail.

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*** Resolution *** Jun 3 2003 8:07AM msadoff

RESOLUTION:
===========

Configure the BOOTP relay agent to forward the Offer frame directly to the
requesting DHCP client instead of to the broadcast address. For help
configuring
the router, contact the manufacturer.

For additional information about BOOTP relay, see the following article:

120932 DHCP: Spanning Multiple Subnets
http://support.microsoft.com/?id=120932

Shilpa Sinha
This posting is provided "AS IS" with no warranties, and confers no rights.



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