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robdorre

join:2012-09-29
Shorewood, IL

1 edit

[HELP] Cisco 2821

I have a cisco 2821 with no cards in it. I have a 20/20 meg metro eithernet getting installed. What cards do I need to make the the connection? Also what cards can I put in to have the router have wifi?

or what router would I need to get the metro to work, wifi and built in dhcp?



tubbynet
reminds me of the danse russe
Premium,MVM
join:2008-01-16
Chandler, AZ
kudos:1

the c2821 has two built-in ge interfaces (though you'll not get full gig-e on the box). it'll handle a 20/20 with no issues, even with light services (firewall, nat, etc).
when you say wifi -- are you looking for a built-in ap, or a wireless controller to handle multiple aps?

q.
--
"...if I in my north room dance naked, grotesquely before my mirror waving my shirt round my head and singing softly to myself..."


robdorre

join:2012-09-29
Shorewood, IL

built in wifi. dose the 2821 have dhcp functions or what would work best to get one router with dhcp and wireless in one? Im looking for something cheap but works well.


aryoba
Premium,MVM
join:2002-08-22
kudos:4

The 2821 (as well with most modern Cisco routers) has capability of being DHCP server though it may only offer basic functionality compared to full-blown dedicated DHCP server. You simply need to verify the IOS image the router runs has such DHCP feature.


sk1939
Premium
join:2010-10-23
Mclean, VA
kudos:10
Reviews:
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reply to robdorre

As Aryoba said, it depends on the image the 2821 is running. As far as all-in-one, you can get such a device, but it introduces a single point of faliure. Getting a seperate access point/controller allows you to go with a vendor other than Cisco if you wanted to. Depending on your needs you could look at Ubiquiti, HP, or Aruba Networks as alternate vendors.



TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5
reply to aryoba

said by aryoba:

(as well with most modern Cisco routers)

Name one that cant.


TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5
reply to sk1939

Even an external access point presents a single point of failure.

Lose your AP and a good chunk of your users will be offline or inconvenienced, just as they would be if the card in the router died.

If the router dies, an external AP doesnt really help you anyway.

Think of it in different terms, its a single point of administration, and easier to install. Ship the box to the site preconfigured, and even the ditzy receptionist can get it up and running.

In the case either device dies, you have more to worry about than any individual component.

If you really want to avoid outages, then you need to invest in a full 1+1 setup, redundant routers with redundant WAN circuits, redundant switches, APs and controllers.


tunerX

join:2012-02-20
reply to robdorre

Metro will work as standard CPE devices are only required to support 802.3 specs.

The wifi HWIC only supports b/g/a... no N support.

IOS DHCP is RFC compliant and can use any of the RFC 2132 dhcp options.

It will also support 170K PPS with only IP routing enabled (theoretical backplane is 2 gbps with 1500 byte frames). Adding other technologies like filtering, qos, and telephony will reduce the PPS.


aryoba
Premium,MVM
join:2002-08-22
kudos:4
reply to TomS_

said by TomS_:

said by aryoba:

(as well with most modern Cisco routers)

Name one that cant.

The ones that do not run the proper IOS image

tunerX

join:2012-02-20

DHCP is part of IP Base, so it would have to be a router without an IOS or a broken router.


HELLFIRE
Premium
join:2009-11-25
kudos:18
reply to robdorre

said by robdorre:

What cards do I need to make the the connection?

Depends what physical layer connection the provider's bringing to you. Are they pulling in fiber or copper?
If copper, is it RJ-45?

said by robdorre:

Also what cards can I put in to have the router have wifi?

All the compatible cards and modules that a 2800-series will take -- »www.cisco.com/en/US/products/ps5···les.html

said by robdorre:

dose the 2821 have dhcp functions or what would work best to get one router with dhcp and wireless in one?

Are you looking for an all-in-one but a step above what you can buy from linksys / dlink / netgear / et al?
Or as others have pointed out you are looking for a true redundant and reliable 24x7x365, 5x9s system?

My 00000010bits

Regards

cramer
Premium
join:2007-04-10
Raleigh, NC
kudos:9
reply to robdorre

It's "metro ethernet", so unless the port is gig, it will almost always be a standard copper/RJ45 fast ethernet handoff.

I don't understand the push for the oh-so-damned-expensive HWIC-AP, when any simple, cheap "wireless router" can handle the job. Plus, they're cheap as dirt, and available everywhere; if it breaks, it takes minutes to replace (at $29 each, you can have a box of spares in a drawer.)



TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

But can they do .1x ?


sk1939
Premium
join:2010-10-23
Mclean, VA
kudos:10

Depends on the model, but for the most part no. Besides, the $50 Ubiquiti or used Cisco AP would do the job for less money than the HWIC anyways.