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List:       ipcop-user
Subject:    [IPCop-user] R:  Strange DHCP problem (RED Interface)
From:       "Bruno Ferri" <bruno () queiragazzi ! com>
Date:       2007-08-30 18:25:31
Message-ID: 000001c7eb33$25e7b4b0$71b71e10$ () com
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> -----Messaggio originale-----
> Da: ipcop-user-bounces@lists.sourceforge.net [mailto:ipcop-user-
> bounces@lists.sourceforge.net] Per conto di Doc. Caliban
> Inviato: giovedì 30 agosto 2007 17.37
> A: ipcop-user@lists.sourceforge.net
> Oggetto: [IPCop-user] Strange DHCP problem (RED Interface)
> 
> I am in a building which is fed by a single CAT5 backbone from the
> router in the main building.  The backbone is patched to a 9-port
> switch.  The 9-port switch then feeds 3 24-port switches.
> 
> My IPCop machine has the RED interface configured to use DHCP.
> 
> If I place the IPCop machine between the backbone and the 9-port
> switch,
> the red interface does not draw an IP address from the router in the
> main building.  If I specify a static IP for the RED interface, it will
> still not connect to the router.
> 
> If I plug my laptop straight into the backbone, it successfully
> acquires
> an IP via DHCP from the router in the main building.
> 
> As if that's not weird enough, this is where it really gets odd:
> 
> If I leave the backbone feed plugged into the 9-port switch and place
> the IPCop machine between one of the ports on the 9-port switch and the
> uplink port on one of the 24-port switches, it works just fine.... the
> RED interface acquires an IP via DHCP from the router in the main
> building and all the traffic from the 24-port routes through the IPCop
> machine via the GREEN interface.
> 
> If I skip the 9-port altogether and plug the backbone into the RED
> interface and the same 24-port uplink into the GREEN interface, the
> same
> problem happens:  The RED interface will not draw an IP address.

If I'm not wrong, when there's a cross/straight mismatch issue, NIC's led shouldn't \
even light up and the card stays disconnected, even though it happened to me a couple \
of times they lit up but without being able to carry any traffic.

It could be a VLAN tagged vs untagged port issue too.. Your 9p switch may be \
VLAN-aware and support the possibly tagged uplink port from your backbone, your \
notebook NIC could be vlan aware too, even if those NICs are used to be found on \
mid/high-end servers.

A bit unlikely, but who knows.



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