3550 help-address problem

[wu.rongwei]

The 3550 IOS version is 12.1(6)EA1. I use help-address to forward DHCP request. But it cant work. When I debug ip udp, I can see 3550 forward udp 139 to help-address, but not forward udp 67,68.

[s.lemberg]

hi,

use the command "ip forward-protocol udp " to add the

port numbers.

regards

sascha

[Prashanth Krishnappa]

We forward the following ports by default

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 (ports 67 and 68)

TACACS service (port 49)

Do you have any inbound access lists applied? If you do look at the following bug

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw23340

This bug is fixed in 12.1(9)EA1