From: Thomwin Chen (thomwin_chen@yahoo.com)
Date: Thu Jul 14 2005 - 00:54:18 GMT-3
Yup,,
it's slightly different.
if the client and the DHCP server on the same segment, the DHCP server replies to port 68 (bootpc).
but if using relay agent, the DHCP server unicasts to relay agent on port 67 (bootps).
"Church, Chuck" <cchurch@netcogov.com> wrote:
What you're seeing is correct, if I remember right. A client seeking an
IP address uses bootpc ports, and the server's response is bootps. I
may have it backwards, but I know both are involved in a normal
exchange.
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
gladston@br.ibm.com
Sent: Wednesday, July 13, 2005 9:39 PM
To: ccielab@groupstudy.com
Subject: Reflexive-access list - DHCP - Helper-address
When using access-list with DHCP and IP helper-address, this was the
needed entry:
permit udp host 100.5.14.1 eq bootps host 100.5.46.4 eq bootps
100.5.14.1 is the dhcp router (R1).
100.5.46.4 (R4) is the router configured with ip helper-address. It is
also the router with Reflexive access-list on the interface pointing to
R1.
R1 answers the dhcp request using destination port 67. It seems it
considers R4 as a dhcp server.
Have you worked with similar configuration?
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