Comments on: IP Routing in Small Networks

By: Aaron

Aaron — Sat, 11 Jul 2015 08:50:51 +0000

Hi there,
DHCP scopes usually accept to send static route entries to the clients. So I will put a last resort to the internet router and a specific one to the ASA firewall.
Another solution will be set only a default and redirection in the internet router for the company behind the firewall.
A bunch more solutions come to my mind. What I strongly recommend is to set always the default in the Internet router and the specific ones separated.

Cheers

By: Tim

Tim — Sat, 20 Jun 2015 18:44:13 +0000

Michael; you are one of the few with Nortel experience; I have an odd question…

I have some Grandstream HT701’s unregistered on a stand alone router (no PBX, no Internet), performing IP address dialing. The POTL’s connected to the 701 can receive IP addressed calls, and dial IP addresses as well, using this dialing syntax:
*47192*168*xxx*xxx

The *47 tells the HT701 that this will be an IP addres type call, followed immediately by the other phones IP address. “Stars” are used in place of the decimal on the Grandstream HT701.

I recently aquired a Nortel 1535, and plugged it into the router that connects to the Grandstreams. I was able to “register” the Nortel; and get a dialtone.

Here’s the strange part:
I can dial the Nortels IP from the Grandstreams HT701… and the Nortel will ring and a two way telephone call works fine; the Nortel displays “IPCall” on the screen as the phone rings.

But, I can not figure out how to dial (via IP address) from the Nortel to the Grandstream. I believe it’s a dialing syntax problem; as the Grandstream requires a few tricks in the dialing string, and I assume the Nortel has the same uniqueness. I can’t seem to find instructions on how to dial an IP address from the Nortels. I even tried entering the IP address into the Phonebook contact list; thus trying to dial an IP with a real IP format (using decimals).
Are you aware of any method to dial out -via IP address- on a Nortel?

Tim

By: Gerson

Gerson — Thu, 14 May 2015 17:33:58 +0000

Hi michael.

I have some avaya 4550t-pwr switches in my office. I am about to implement a voip solution. My question is Do you have a tutorial on how configure it a port when you are going to have data a voice in the same port and both vlans with different DHCP? example vlan data DHCP is 172.16.10.0 and vlan voice 172.16.20.0.

Thank you

By: Kristian Durvin

Kristian Durvin — Tue, 12 May 2015 16:13:04 +0000

I used to see this a lot in small companies that just started expanding, but honestly not so much any more. It seems with the cost of L2/L3 switches falling, the dedicated router has been slowly fading away. I am finding more and more the L2/L3 switch is now the default gateway and the firewall/VPN device in it’s own VLAN and the WAN links terminate as Ethernet right on the L2/L3 switch. I am just waiting now till someone drops the firewall/VPN capability in to the switch next.

By: Nick Moody

Nick Moody — Fri, 08 May 2015 18:39:05 +0000

Hi Michael, great post. For smaller networks I’d go with Del Bullion’s suggestion with the caveat that the amount of traffic destined for both the corporate WAN and the Internet doest oversubscribe the little 2921. On large networks I’d stipulate that the device connecting the hosts to the network is a layer 2 / 3 switch. Configure an SVI on the switch to be the DG for the hosts with a default route pointing at the ASA and the RFC1918 addresses pointed at the 2921 router?

Cheers,
Nick

By: Michael McNamara

Michael McNamara — Fri, 08 May 2015 01:10:59 +0000

In reply to Del Bullion. That's certainly one way to do it Del. Thanks for the comment!

By: Del Bullion

Del Bullion — Wed, 06 May 2015 06:56:42 +0000

In a scenario liked you described I have been making the Cisco 2921 the Gateway and the connecting the ASA to an open port on the 2921 within a new IP range.

Is that how you would do it?