From: Church, Chuck (cchurch@wamnetgov.com)
Date: Sun Dec 14 2003 - 23:11:49 GMT-3
Below.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
-----Original Message-----
From: Pun, Alec CL [mailto:Alec.CL.Pun@pccw.com]
Sent: Sunday, December 14, 2003 8:53 PM
To: Church, Chuck; Alec; Ozgur Guler (Garanti Teknoloji); ccielab
Subject: RE: ip helper-address
so that means the following pairs of command MUST be used together ? thanks.
1) if default 8 ports are required
ip helper-address
ip forward-protocol udp
No. If you only need the 8 default ports, you only need the helper address. 'ip forward-protocol udp' with no port listed will cause all UDP broadcasts to be 'helped'.
2) if additional udp port is required
ip helper-address
ip forward-protocol udp <new_port>
Yes.
rgds,
alec
-----Original Message-----
From: Church, Chuck [mailto:cchurch@wamnetgov.com]
Sent: Monday, December 15, 2003 9:37 AM
To: Alec; Ozgur Guler (Garanti Teknoloji); Pun, Alec CL; ccielab
Subject: RE: ip helper-address
No, it means that those ports are the default that an ip helper statement will handle. If you configure a helper address on an interface and nothing else, these 8 ports will be forwarded:
69 TFTP
67 BOOTP Client
68 BOOTP Server
37 Time Protocol
49 TACACS
53 DNS
137 NetBios
138 NetBios Datagram
If you want to 'help' a protocol other than those above, add that port with the ip forward-protocol command. If you don't want all 8 of the above forwarded (which is a good idea if you're only trying to get DHCP to work), then use a no ip forward-protocol udp x for those of the 8 that you don't need.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
> -----Original Message-----
> From: Alec [mailto:clapun@graduate.hku.hk]
> Sent: Sunday, December 14, 2003 7:46 PM
> To: Ozgur Guler (Garanti Teknoloji); Pun, Alec CL; ccielab
> Subject: Re: ip helper-address
>
>
> does that it mean if the destination port is TFTP, Domain
> Name System (DNS),
> Time, NetBIOS, ND, BOOTP or DHCP packet, then no ip
> forward-protocol command
> is needed ?
>
> rgds,
> alec
> ----- Original Message -----
> From: "Ozgur Guler (Garanti Teknoloji)" <OzgurG@garanti.com.tr>
> To: "Pun, Alec CL" <Alec.CL.Pun@pccw.com>; "ccielab"
> <ccielab@groupstudy.com>
> Sent: Monday, December 15, 2003 12:20 AM
> Subject: RE: ip helper-address
>
>
> > CCO
> > -----
> >
> > All of the following conditions must be met in order for a UDP or IP
> packet to be helpered by the ip helper-address command:
> >
> > The MAC address of the received frame must be all-ones
> broadcast address
> (ffff.ffff.ffff).
> > The IP destination address must be one of the following: all-ones
> broadcast (255.255.255.255), subnet broadcast for the
> receiving interface;
> or major-net broadcast for the receiving interface if the no
> ip classless
> command is also configured.
> > The IP time-to-live (TTL) value must be at least 2.
> > The IP protocol must be UDP (17).
> > The UDP destination port must be for TFTP, Domain Name
> System (DNS), Time,
> NetBIOS, ND, BOOTP or DHCP packet, or a UDP port specified by the ip
> forward-protocol udp global configuration command.
> >
> >
> > Ozgur
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> > Pun, Alec CL
> > Sent: Sunday, December 14, 2003 6:02 PM
> > To: ccielab
> > Subject: ip helper-address
> >
> >
> > When I use ip helper-address to handle, say DHCP request
> where the server
> is
> > located on another subnet, do I need to use ip
> forward-protocol udp as
> well
> > ? If not, when to use this command ?
> >
> > tks
> > alec
> >
> >
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