DHCP Relay Problem

  • Thread starter Thread starter romo
  • Start date Start date
R

romo

Hello,

I've configured RRAS to route between two subnets, but I can't get DHC
relay to work.

The network consists of subnet A and subnet B with network addresse
192.168.168.0/24 and 192.10.10.0/24.

A W2K Small Business Server on subnet A (192.168.168.9)is running DHC
with scopes for the two subnets.

A W2K Server with NICS on the two subnets (192.168.168.58 an
192.10.10.1) is running RRAS and is configured as a lan router. I
addition, I've installed DHCP relay with the address of the DHCP serve
located on subnet A and an interface on subnet B.

I have a single Win98 computer attached to subnet B and I've configure
tcp/ip to obtain an address automatically, however, it fails to obtai
an IP address.

Using W2K Network Monitor to capture the DHCP packets on the DHC
server and the RRAS server show me the following:

The DHCP Discover broadcast by the Win98 machine is being received b
the DHCP relay; the DHCP Discover sent by the DHCP relay is bein
received by the DHCP server; and the DHCP Offer sent by the DHCP serve
is being received by the RRAS server on the interface connected t
subnet A.

The DHCP Offer reflects the information in the scope for subnet B.

In addition, I checked the DHCP relay agent interface on subnet B show
the following:
Relay Mode: Enabled
Requests Received: 44
Replies Received: 0
Requests Discarded: 11
Replies Discarded: 0

I also see that I'm getting Event ID: 30022 "IPBOOTP was unable t
receive an incoming message on the local interface with IP addres
192.10.10.1. The data is the error code." and Data 0000: 38 27 00 00
Unfortunately, a google search doesn't yield anything helpful.

Apart from the DHCP problem TCP/IP appears to be functioning normall
on the Win98 computer. In fact, if I manually configure the Win9
computer everything works just great.

TIA for your help.

--Bob Montgomer

rom
 
Kadir,

Can you elaborate please?

I've read the KB article, but since the RRAS server appears to log o
normally I don't see how this applies.

Best Regards,
Bob Montgomery
*The problem looks like the one mentioned in the KB article. Check t
see if
this solves.

http://support.microsoft.com/?kbid=827507

--
Kadir

(e-mail address removed) [MSFT]
This posting is provided "AS IS" with no warranties, and confers n
rights.

romo said:
Hello,

I've configured RRAS to route between two subnets, but I can't ge DHCP
relay to work.

The network consists of subnet A and subnet B with networ addresses
192.168.168.0/24 and 192.10.10.0/24.

A W2K Small Business Server on subnet A (192.168.168.9)is runnin DHCP
with scopes for the two subnets.

A W2K Server with NICS on the two subnets (192.168.168.58 and
192.10.10.1) is running RRAS and is configured as a lan router. In
addition, I've installed DHCP relay with the address of the DHC server
located on subnet A and an interface on subnet B.

I have a single Win98 computer attached to subnet B and I'v configured
tcp/ip to obtain an address automatically, however, it fails t obtain
an IP address.

Using W2K Network Monitor to capture the DHCP packets on the DHCP
server and the RRAS server show me the following:

The DHCP Discover broadcast by the Win98 machine is being receive by
the DHCP relay; the DHCP Discover sent by the DHCP relay is being
received by the DHCP server; and the DHCP Offer sent by the DHC server
is being received by the RRAS server on the interface connected to
subnet A.

The DHCP Offer reflects the information in the scope for subnet B.

In addition, I checked the DHCP relay agent interface on subnet shows
the following:
Relay Mode: Enabled
Requests Received: 44
Replies Received: 0
Requests Discarded: 11
Replies Discarded: 0

I also see that I'm getting Event ID: 30022 "IPBOOTP was unable to
receive an incoming message on the local interface with IP address
192.10.10.1. The data is the error code." and Data 0000: 38 27 0 00.
Unfortunately, a google search doesn't yield anything helpful.

Apart from the DHCP problem TCP/IP appears to be functionin normally
on the Win98 computer. In fact, if I manually configure the Win98
computer everything works just great.

TIA for your help.

--Bob Montgomery


romo
Click to expand...
Click to expand...

rom
 
Bob
The error message you noticed in the eventvwr logs means the packet size is
larger than the buffer size. As in your setup The DHCP request passes
through a Windows 2000 DHCP relay agent and The DHCP response packet is, in
most liklyhood, larger than 576 bytes, the 2000 server is dropping the
response and hence you are not able to see the response coming to the other
side of the network (as noticed by you from your netmon logs). Please try
the hotfix as suggested in the KB by following the guidelines given in KB.
In case, you still see the issue, we will try to investigate further but as
of now, it seems to be a known problem.

Thanks & Regards,
--
Sandeep

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



romo said:
Kadir,

Can you elaborate please?

I've read the KB article, but since the RRAS server appears to log on
normally I don't see how this applies.

Best Regards,
Bob Montgomery
*The problem looks like the one mentioned in the KB article. Check to
see if
this solves.

http://support.microsoft.com/?kbid=827507

--
Kadir

(e-mail address removed) [MSFT]
This posting is provided "AS IS" with no warranties, and confers no
rights.

romo said:
Hello,

I've configured RRAS to route between two subnets, but I can't get DHCP
relay to work.

The network consists of subnet A and subnet B with network addresses
192.168.168.0/24 and 192.10.10.0/24.

A W2K Small Business Server on subnet A (192.168.168.9)is running DHCP
with scopes for the two subnets.

A W2K Server with NICS on the two subnets (192.168.168.58 and
192.10.10.1) is running RRAS and is configured as a lan router. In
addition, I've installed DHCP relay with the address of the DHCP server
located on subnet A and an interface on subnet B.

I have a single Win98 computer attached to subnet B and I've configured
tcp/ip to obtain an address automatically, however, it fails to obtain
an IP address.

Using W2K Network Monitor to capture the DHCP packets on the DHCP
server and the RRAS server show me the following:

The DHCP Discover broadcast by the Win98 machine is being received by
the DHCP relay; the DHCP Discover sent by the DHCP relay is being
received by the DHCP server; and the DHCP Offer sent by the DHCP server
is being received by the RRAS server on the interface connected to
subnet A.

The DHCP Offer reflects the information in the scope for subnet B.

In addition, I checked the DHCP relay agent interface on subnet B shows
the following:
Relay Mode: Enabled
Requests Received: 44
Replies Received: 0
Requests Discarded: 11
Replies Discarded: 0

I also see that I'm getting Event ID: 30022 "IPBOOTP was unable to
receive an incoming message on the local interface with IP address
192.10.10.1. The data is the error code." and Data 0000: 38 27 00 00.
Unfortunately, a google search doesn't yield anything helpful.

Apart from the DHCP problem TCP/IP appears to be functioning normally
on the Win98 computer. In fact, if I manually configure the Win98
computer everything works just great.

TIA for your help.

--Bob Montgomery


romo
------------------------------------------------------------------------
Click to expand...
Click to expand...


romo
Click to expand...
 
Kadir,

I just installed the hotfix and dhcp relay is now working!

The DHCP Offer was 656 bytes and I guess that was the problem.

Thanks,
Bob Montgomery
*Bob
The error message you noticed in the eventvwr logs means the packe
size is
larger than the buffer size. As in your setup The DHCP reques
passes
through a Windows 2000 DHCP relay agent and The DHCP response packe
is, in
most liklyhood, larger than 576 bytes, the 2000 server is droppin
the
response and hence you are not able to see the response coming to th
other
side of the network (as noticed by you from your netmon logs). Pleas
try
the hotfix as suggested in the KB by following the guidelines give
in KB.
In case, you still see the issue, we will try to investigate furthe
but as
of now, it seems to be a known problem.

Thanks & Regards,
--
Sandeep

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



romo said:
Kadir,

Can you elaborate please?

I've read the KB article, but since the RRAS server appears to lo on
normally I don't see how this applies.

Best Regards,
Bob Montgomery

Kadirvel C Vanniarajan [MSFT] wrote:


romo
------------------------------------------------------------------------
Click to expand...
Click to expand...

rom
 
Back
Top