[KLUG Members] switches vs. hubs

[Rusty Yonkers]

Have you tried to assign a static IP address on a workstation on the
second switch to see if the workstation can see the rest of the
network?  There is nothing in a switch that should be blocking DHCP. 
The only thing I can think of is if you have spanning tree running
and the port is in blocking mode (it is a real streach).  I would
first verify hardware connectivity using the switch without DHCP. 
Since DHCP is broadcast traffic the switch should simply flood the
request.

One other thing.... is it possible you have a vlan conflict (assuming
you are running a switch with vlans)?

--- Adam Tauno Williams <adam@morrison-ind.com> wrote:
> > I'm having trouble getting DHCP to go through a second switch.
> > I have a DHCP server on a first switch, the two switches are
> connected.
> 
> Are either managed/intelligent switches?
> 
> > Machines on the second switch can't get an IP address.
> > However, if I swap the second switch with a hub (a wireless hub,
> with 
> > DHCP disabled, actually), I can get IP addresses no problem.
> > Easy solution, replace the switch.  Already done that, twice.  Is
> there 
> > some sort of difference as far as DHCP between hubs and switches
> that 
> > I'm overlooking?
> 
> No, the switch is clearly malfunctioning or misconfigured.  I have
> DHCP clients
> in other states using our centralized DHCP server.  They are up to
> five
> switches and four routers away from the DHCP server.  All local
> clients are at
> least two switches away (central DHCP server is plugged into the
> main
> distribution frame switch,  only other servers and the backbone
> plugin into
> that switch,  then other switches hang off the backbone throughout
> the
> building, and clients attach to those).
> _______________________________________________
> Members mailing list
> Members@kalamazoolinux.org
> 


=====
Russell C. Yonkers Jr. 
CNE, MCP, A+, CCNA, Linux+, Server+, Network+ certified
-----------------------------------------
Currently using SuSE 9, Mac OS X, Windows 2000, and WinXP 
And yes I run a network at home with Linux and Windows servers

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