From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Dec 29 2004 - 21:41:23 GMT-3
Joe,
That's a good point to keep in mind.
In the scenario I was working with, that couldn't be an issue - the dhcp
server was one hop
from the dhcp relay.
R4 --- isdn --- R5 ---- R1 (dhcp server)
thanks for pointing that out.
----- Original Message -----
From: "Joe Smith" <j333smith@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, December 29, 2004 6:49 PM
Subject: Re: I E lab 13 - dhcp-server vs ip helper
> Tim,
>
> Do you know the TTL of the DHCP request? If its one, then ip helper
> wouldn't work per the Doc CD, however the Doc CD has no TTL requirement
for
> ip dhcp-server.
>
> Just a thought.
>
> J3
>
>
> >From: "ccie2be" <ccie2be@nyc.rr.com>
> >Reply-To: "ccie2be" <ccie2be@nyc.rr.com>
> >To: "Joe Smith" <j333smith@hotmail.com>, <ccielab@groupstudy.com>
> >Subject: Re: I E lab 13 - dhcp-server vs ip helper
> >Date: Wed, 29 Dec 2004 16:17:22 -0500
> >
> >Joe,
> >
> >On the chance that you were right, I manually added the global, ip
> >forward-protocol, command
> >
> >to see if that would make a difference.
> >
> >Unfortunately, it didn't.
> >
> >I don't understand this.
> >
> >Using the dhcp-server command works. Using the ip helper-address
doesn't.
> >
> >I even rebooted the router after making the change just to make sure.
> >
> >Could it possibly be that I need to change something else in addition to
> >the
> >above?
> >
> >(To test the above, I just removed the dhcp-server and added the ip
helper
> >command.)
> >
> >Tim
> >----- Original Message -----
> >From: "Joe Smith" <j333smith@hotmail.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Wednesday, December 29, 2004 1:38 PM
> >Subject: Re: I E lab 13 - dhcp-server vs ip helper
> >
> >
> > > Then I'm mistaken! Well sort of since you still need it.
> > >
> > > J3
> > >
> > > >From: "ccie2be" <ccie2be@nyc.rr.com>
> > > >To: "Joe Smith" <j333smith@hotmail.com>, <ccielab@groupstudy.com>
> > > >Subject: Re: I E lab 13 - dhcp-server vs ip helper
> > > >Date: Wed, 29 Dec 2004 13:31:22 -0500
> > > >
> > > >Actually, according to the Doc-Cd, ip forword-protocol, is enabled by
> > > >default.
> > > >
> > > >When the ip helper command is used only to forward dhcp/bootp
messages,
> >you
> > > >may want to disabled the
> > > >
> > > >forwarding of other protocols which are also forwarded by default by
> >using
> > > >no ip forword prot xxx.
> > > >
> > > >
> > > >----- Original Message -----
> > > >From: "Joe Smith" <j333smith@hotmail.com>
> > > >To: <ccielab@groupstudy.com>
> > > >Sent: Wednesday, December 29, 2004 1:17 PM
> > > >Subject: RE: I E lab 13 - dhcp-server vs ip helper
> > > >
> > > >
> > > > > If I'm not mistaken don't you also need the "ip forward-protocol"
> > > >command
> > > >in
> > > > > combination with the ip helper?
> > > > >
> > > > > J3
> > > > >
> > > > > >From: "ccie2be" <ccie2be@nyc.rr.com>
> > > > > >Reply-To: "ccie2be" <ccie2be@nyc.rr.com>
> > > > > >CC: "Group Study" <ccielab@groupstudy.com>
> > > > > >Subject: I E lab 13 - dhcp-server vs ip helper
> > > > > >Date: Wed, 29 Dec 2004 12:59:39 -0500
> > > > > >
> > > > > >Hi guys,
> > > > > >
> > > > > >R4's bri interface is configured to have it's ip address
> >negotiated.
> > > > > >
> > > > > >R5 is configured as a dhcp relay & is suppose to get an ip
address
> > > > > >
> > > > > >for R4 from a dhcp server configured on R1.
> > > > > >
> > > > > >R4 --isdn --- R5 ----- R1 (dhcp server).
> > > > > >
> > > > > >This works as it's suppose to when R5 has the global command,
> > > > > >
> > > > > >ip dhcp-server 139.1.15.1, configured.
> > > > > >
> > > > > >But, if the interface command, ip helper 139.1.15.1, is
configured
> >on
> > > > > >
> > > > > >R5, then R4 doesn't get an ip address.
> > > > > >
> > > > > >Can anyone explain why that is?
> > > > > >
> > > > > >I thought, the ip dhcp-server command does the same thing as the
ip
> > > >helper
> > > > > >command except
> > > > > >
> > > > > >that it's more specific.
> > > > > >
> > > > > >TIA, Tim
> > > > > >
> > > > >
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