Re: Cisco Vlan and IP helper
- From: Merv <merv.hrabi@xxxxxxxxxx>
- Date: Thu, 30 Aug 2007 07:23:31 -0700
try
ip forward-protocol udp 1604
Alosmake sure you disable each of the UDP broadcast that is
automatically enabled whne ip helper-address is configured on an
interface.
Asuuming you have WINS server for NETBIOS, then
! Define protocol forwarding on the firewall. When you turn on a
related command,
! ip helper-address, you forward every IP broadcast in the ip forward
protocol
! command list, including several which are on by default: TFTP (port
69),
! DNS (port 53), Time service (port 37), NetBIOS Name Server (port
137),
! NetBIOS Datagram Server (port 138), BOOTP client and server
datagrams
! (ports 67 and 68), and TACACS service (port 49). One common
! application that requires helper addresses is Dynamic Host
Configuration
! Protocol (DHCP). DHCP protocol information is carried inside of
BOOTP packets. The
! "no ip forward protocol" statements turn off forwarding for the
specified protocols.
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
no ip forward-protocol udp domain
no ip forward-protocol udp time
no ip forward-protocol udp tacacs
no ip forward-protocol udp tftp
ip forward-protocol udp bootpc
ip forward-protocol udp bootps
.
- References:
- Cisco Vlan and IP helper
- From: dempsey_b
- Re: Cisco Vlan and IP helper
- From: J.Cottingim
- Re: Cisco Vlan and IP helper
- From: dempsey_b
- Cisco Vlan and IP helper
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