Router questions

[Anddmx]

Hi

Have a a few questions for you experts

If I have 1 router 2600 cisco and that is the only router on the network and I want to connect internet to that router, Do I call Teleco company and just order the internet and they give me a Frame Relay DLCI number or how does this all work. The company has T1 and 1 office

Do I have to order a router with a different nic card for T1? I know it suppost to use Serial port to connect all routers and this only has one router.

I am still learning and curious

thanks

 

[lgarner]

You need a serial interface for a T1. This can be one with an integrated CSU/DSU so you just plug the T1 into it (WIC-1-DSU is the part, I think), or it can be a "real" serial connection which requires an external CSU/DSU. I prefer the first option. If the 2600 has an available WIC slot you just order that card.

What do you mean by "company has T1 and 1 office"? If you have a point-point T1 to another office, you still need another serial i/f for your internet T1.

 

[Anddmx]

The company just has one office with a T1 for internet.
I know how to configure cisco router but I dont understand which WAN protocol this office needs. Example Frame Relay has multipuly sites or Point-to-Point has atleast 2 offices, Ive have to setup office from scratch with no Internet and with just one router. So they ordered Full T1 for this office.

So this is what I should do?

setup router put serial cable into router and into CSD/DSU and configure router like normal and it should work

So I just leave encapsulation with default?

Can someone explain to me how this should be done. properly

thanks for the help

 

[lgarner]

The ISP will tell you what encapsulation to use, as well as IP address information. I have used Frame Relay, HDLC, and PPP for internet access. It depends upon the ISP.

When "they" ordered the T1, "they" should have received this information. If not, you need to find out. Then you configure your router to match the ISP's side. You don't configure your route before you know what is required.

That is how it should be done. Properly.

 

[Anddmx]

Thank you for the information.

So when I get IP information

configt# IP Address (ISP IP ADDRESS) 255.255.255.0

configt# No Shut

encapsulation HDLC , I believe it will be default

Maybe I am looking to far into this.

Thanks

 

[lgarner]

That should be it. As I recall, HDLC is the default for the Cisco router. It's been a few years; my more recent connections have been PPP or Frame. The ISP dictates that.

If they say it's Frame-Relay, be sure to ask the LMI type. If they're not using Cisco equipment, and maybe even if they are, you'll have to configure your router to use ANSI LMI.

Once you have the information, it should be a simple setup. In the worst case, tell them you have a Cisco router and ask how to connect it. With so many people using Cisco, the ISP's support group should have the details memorized by now.

 

[Anddmx]

Thanks for the help.

I have another question.

Now on very large scale WAN with 30 branch office connected to headquarter on Frame-Relay 512 line, each brach office connects to the internet through headquater.What makes this possible? Do you have to setup DNS on the routers or NAT?


I am curious on how that would work

 

[Anddmx]

Let me clear that last reply.

How does ever branch office get internet when it connect to the headquaters?

This is the question I am trying to find answer.

sorry

 

[lgarner]

OK, I think I understand your situation. You have only one Internet connection which terminates at the main office. You have other offices which connect to the main office via private network (Frame Relay, P-P, whatever). These offices to not have their own Internet connections.

Once the main office has a working Internet connection, you only need to set default routes in the routers. The Internet router will have "ip route 0.0.0.0 0.0.0.0 <isp address>". The remote offices will have "ip route 0.0.0.0 0.0.0.0 <main office address>". So, traffic which has no other route specified goes to the Internet.

Other issues to look at would include Network Address Translation if you're not using public addresses throughout and access control on your border router (the 2600 at main office).

 

[Anddmx]

Yep.. Thats the answer Ive been looking for thanks you.