08-12-2002 12:06 AM - edited 03-02-2019 12:36 AM
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.
08-12-2002 12:47 AM
hi,
use the command "ip forward-protocol udp " to add the
port numbers.
regards
sascha
08-12-2002 11:54 AM
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
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