From: Charles Ragan (ciscojock2002@yahoo.com)
Date: Wed Sep 17 2003 - 13:22:55 GMT-3
hmm...different scopes obviously for the pc's and the phones....does the
dhcp server know how to get back (route) to the routing interface
that you've applied the ip helper address to for the phones? This will be
the giaddress that is in the dhcp request and if the dhcp server can't
reach that subnet, then that'll break the phone not getting it's ip
address.....
just a thought.
Charles
At 11:05 AM 9/17/2003 -0400, qwerts2@email.com wrote:
>Hello group,
> Watched this list for about two years and now I have something to
> ask for insight into. So here goes.........
>The question is a switching question relating to residual commands/effects
>of commands that for all intents and purposes should not be there. No
>working config to go off of but have complete details of equipment used
>and such. Here goes.
>
> ____ ____ ____ ____ ____ ____ ____PC
> PC Internet Pix501 7500____5000 3524 3524____7960
>
>PC= 192.168.10.2
> |
> Internet
> |
>Pix501= 192.168.10.1
> |
>7500= FA0/0 192.168.9.65/26, FA0/1 192.168.9.129/26
> |
>5000= interface vlan50, interface vlan51 (no ip addresses)
> |
>3524= Trunk link (Trunks allow all vlans)
> |
>3524= Trunk link with "access vlan50 on 0/1" "voice 51 on 0/24"
>
>
>((((((The internet PC is at say 192.168.10.2, the outside interface of
>the Pix is 192.168.10.1. The inside interface of the Pix is 192.168.8.1,
>the pix has routes both to the outside world and inside networks that
>work.(allowing everything and have proved traffic goes through the Pix
>from the inside PC)
> The pix is translating everything that comes through it. All layer
> three devices know about all related networks. Default on Pix to
> internet, default pointing to Pix on 7500. Inter-network routes on Pix
> pointing to 7500.
> Connection between Pix and 7500 is 192.168.9.0/24 with 192.168.9.1
> and 192.168.9.2 respectively, in addition a DHCP server at 192.168.9.3.
> Internal network is 192.168.8.0/26 using 192.168.8.65 and
> 192.168.9.129 on interface Fa0/0 and Fa0/1 respectively. ))))))
>
> On the Fa interfaces of the 7500 the ip helper-address 192.168.9.3
> is in effect on both. There is no VLAN information on the FA interfaces
> of the 7500.
> I could not access the switch console connection of the 5000 and
> only had access to the RSM router prompt. There were previously inputted
> commands on the switch side of the 5000 that had the ports going to the
> 7500 that would assign vlan 90 to FA0/0 and vlan 91 to FA0/1.
> With these commands being there and then being taken off, there was
> still residual effects after the commands were removed. When I accessed
> the 5000 and could only access the RSM the only way I could think of to
> get this connection up was to add interface vlan 50 & 51 on the RSM side
> of the 5000. This brought up the connection to both interfaces one at a
> time to the respective interfaces that would be related to adding vlan 50
> or 51 and doing no shut. I did not add any addresses to these interfaces.
> Here is where it is interesting. I was able to get a DHCP address on
> the internal PC and could go out to the internet and download via FTP.
> However the 7960 was not able to get its address or if it could I could
> not tell as I did not clear the config of the phone as I was out of time.
>
> The main question why was the pc able to get an address and the 7960
> not ? LOL
>
>(My main thought on this is that somehow the switch still has record of
>the vlan and the port association even though the vlan was not "active" at
>the time, maybe by me adding the "interface vlan 50" it went active and
>then could reassociate itself with said port(s) )) ......ie. "show vlan 50"
>Again I am thinking that the commands were removed from the switch side
>but have yet to reproduce the effects. No 5000 to play with ;(
>Any insight would be appreciated and if I am incorrect in posting this
>question here please direct me to the proper place.
>Thanks again.
>Cheers,
>Franklin Hall
>IE # (I wish)
>
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Charles Ragan Jr., Technology Consultant
Principal Consultant - CCIE #1764
Cell Phone - 336-442-4361
http://www.geocities.com/ciscojock2002/
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