It's a fast Ethernet trunk, actually. I forgot to mention that. He does have
some internal servers. Do you think in and out of a Fast Ethernet trunk will
be less of a problem?

You know my first reaction was also just move the subnet mask over. But he
didn't seem to want to do that.

He had a broadcast meltdown last week. Perhaps that's why he's concerned. He
was using ghosting software.

Thanks for the input!

Priscilla

Chuck Church wrote:
> 
> If everyone just goes to the internet, it'll work.  But if
> you've got one or
> more servers internally, I'd be real afraid of trunking on a 10
> mb interface.
> You'll reduce your broadcasts, but I think performance will
> suffer horribly
> crossing the router.  Since you've run out of addresses on a
> /24, I assume
> you've got a couple hundred devices.  Personally I'd just move
> the mask back
> one or 2 bits, making it a /22 or /23, and using the additional
> 1.0 or 1,2,
> and 3.0 subnets.  There's things you can do to almost all OSs
> to reduce
> broadcasts.  How many broadcasts are you seeing per second?  If
> it's no more
> than 20 on average, I wouldn't even worry about it.
> 
> Chuck Church
> CCIE #8776, MCNE, MCSE
> 
> >The customer has been using 192.168.168.0/24 in one small flat
> LAN. He
> >has run out of these addresses and is being hit by performance
> issues
> >related to broadcasts.
> 
> >He wants to implement subnets and VLANs:
> 
> >VLAN 100 192.168.168.0/24
> >VLAN 200 192.168.169.0/24
> 
> >New design:
> 
>  Internet
>      |
>      s0
>   2600 router e1 --- public servers
>      e0
>      | dot1q trunk
>    switch
> VLAN 200 VLAN 100
> 
> There is just one DHCP server. It will be in VLAN 100, address
> 192.168.168.10. The DHCP server will have 2 scopes for the 2
> subnets.
> 
> We're going to do inter-VLAN routing on the 2600 router.
> 
> Will this config work as far as DHCP is concerned?
> 
> interface ethernet 0
> no ip address
> interface ethernet 0.1
> encapsulation dot1q  100
> ip address 192.168.168.1  255.255.255.0
> interface ethernet 0.2
> encapsulation dot1q  200
> ip address 192.168.169.1  255.255.255.0
> ip helper-address 192.168.168.10
> 
> 




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