Newbie Question: 802.1q and VLAN interfaces on 877w

All,

I'm planning to buy my first Cisco router, an 877w. Could anyone take
a quick look at my ideas below and let me know if this can be achieved
with an Advanced IP Services image please?

I have 2x Cisco 7941 phones (old phones from work), a static /29 block
from my ISP (PPPoA connection) and a few PCs on the local network.

I would like to give the 7941's an address from the static ISP-
allocated range. Any traffic from the phones should be routed without
NAT, directly to the ISP's gateway. PCs plugged into the spare port on
the back of the phones should receive a 192.168.0.x address and be
NAT'ed on their way to the internet. PCs attached to wireless would
act in the same way as the PC's hooked up to the back of the phones.

I think this can be achieved using 802.1Q VLAN trunking and layer 3
VLAN interfaces on the router, but I'm only a newbie. Could anyone
confirm please?

* There would be two VLANS trunked through fa0/0-3. The PCs would be
in the Native VLAN, the phones in a trunked VLAN .

* The Wireless interface would have only the Native VLAN, since there
is no possibility to attach phones.

* Each VLAN would have it's own VLAN interface with a seperate DHCP
pool.

* One DHCP pool would contain the /29 from the ISP (minus one address,
used by the ATM0 interface) to be allocated to the phones, the other
DHCP pool would contain the 192.168.0.x/24 range, for allocation to
the PCs.

* The VLAN interface for the PCs would have an "IP nat inside source"
statement

* The VLAN interface for the Phones would not require this statement

* The ATM0 interface would have an "IP nat outside" statement and an
associated dialer interface.

Does the above sound plausible on this entry-level router?

One question I don't know the answer to is, how will the phones know
to use the trunked VLAN rather than the native? Do they need some kind
of special setting to ask them to only send traffic along the trunk,
while leaving the native for an attached PC?

Sorry this has been such a long explanation and thank you to anyone
who responds.

All the best

James.

.

Relevant Pages

  • Re: Mitel DHCP disaster
    ... Does the scope for the DHCP server that is on VLAN 1, ... programmed that the Mitel phones need? ...
    (comp.dcom.telecom.tech)
  • Re: Help with Vlan passthru for phones to another switch on Cisco Catalyst 3750
    ... If you want to pass VLANs from one switch to another, ... Cisco IP Phones. ... configured on the port. ... Vlan not my data Vlan. ...
    (comp.dcom.sys.cisco)
  • VLAN security question
    ... installed a Cisco switch, programmed the switch to route Internet ... Internet traffic is now on a VLAN, ... VLAN traffic can be seen there (sensible because the phones contain ... can send packets onto the telephone VLAN (i.e., ...
    (freebsd-questions)
  • Re: Vlan Interface drops
    ... I am troubleshooting QOS issues on a switched network, ... both output and input drops on vlan interfaces. ... hard time understanding why the packets would be dropped. ... and are routed via this vlan interface. ...
    (comp.dcom.sys.cisco)
  • Re: Dynamic VLAN-Assignment in a large Network
    ... value of the port to someone who plugs into it. ... As for phones and PCs ... belonging to VoIP phones to the phone VLAN. ... But how can this database ...
    (microsoft.public.internet.radius)