Re: CISCO DHCP Config
"Charles_Ragan@ins.com" <Charles_Ragan@ins.com> Thu, 03 October 1996 17:28 UTC
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Date: Thu, 3 Oct 1996 13:18:13 -0400
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From: "Charles_Ragan@ins.com" <Charles_Ragan@ins.com>
To: Multiple recipients of list <dhcp-v4@bucknell.edu>
Subject: Re: CISCO DHCP Config
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On the LAN interface that the host is connected to; Router A Interface e0 ip helper-address <address of the dhcp server> When an IP HELPER-ADDRESS is configured, the Cisco will by default forward the following UDP port values. Trivial File Transfer (TFTP) (port 69) Domain Name System (port 53) Time service (port 37) NetBIOS Name Server (port 137) NetBIOS Datagram Server (port 138) Boot Protocol (BOOTP) client and server datagrams (port 67) Boot Protocol (BOOTPS) Server (port 68) TACACS service (port 49) The only port required for DHCP is port 67 (BOOTPS). Enabling port 67 will allow the Cisco router to act as a BOOTP relay agent (see RFC 1542). To disable the forwarding of the default UDP ports, the following is recommended. It is noted that NTP and other UDP requirements will vary within Mobil Oil, and the excerpt below is for awareness only. At 12:14 PM 10/3/96 -0400, Dave.Gernert@SSCEMAIL wrote: > >We are using the ISC DHCP server under Linux 2.0 on a Token Ring network. We >have several sites connected via a WAN using CISCO routers. We are having >problems getting DHCP broadcasts to pass through the routers. Does anyone >have a sample configuration for CISCO routers that they would share? > >TIA, >David A. Gernert >Capital Blue Cross > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~ Charles_Ragan@ins.com Senior Network Systems Consultant International Network Services Pager - 1-800-INS-1-INS CCIE, MCSE, CBE, MCNE THE POWER OF OPERABLE NETWORKS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~
- CISCO DHCP Config Dave.Gernert@SSCEMAIL
- Re: CISCO DHCP Config Charles_Ragan@ins.com
- Re: CISCO DHCP Config Tim Sylvester