From: Andy Mrozek (AndyMrozek@yahoo.com)
Date: Wed Dec 29 2004 - 21:10:03 GMT-3
I have seen IP-helper work over multiple hops , say up to 5 with no
issues , albeit not over ISDN which may change that , but say from a
ethernet interface facing a group of hosts , who hit the NOC controlled
centralized dhcp server..... Is there a setting you have seen to modify
this ttl ???
Joe Smith wrote:
> 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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