Need help with Cisco routers :(

[mcsnoogins]

I'm new to cisco routers, i've very experienced with run of the mill home products like netgear etc. but i'm missing somethign here.

I'm trying to setup a SRP-527W Router for a client. I have all the details in (Username, password, vci, vpi etc.). The adsl is connecting at 20Mbps but i'm getting no internet access. I'm getting the impression i need to setup static routing or something to enable the router to let traffic from the inside to the outside world but i have no experience with this. Can someone help or am i asking too much from a forum?

Chris

[Jon Marshall]

Chris

Your not asking too much but these forums tend to deal with enterprise level devices so help may be limited ie. i can tell you what to look for but i have no idea how that would be configured on your paticular device.

Things to check -

1) can your LAN clients ping the inside interface ofthe SRP device ?

2) if they can then to get to the internet you usually need to sort out 3 things -

i) you need  a default-route on the SRP. This would send all traffic out to the internet. On a router this would look like -

ip route 0.0.0.0 0.0.0.0

ISP next-hop would be the IP address at the other end of your link so it would be an IP address from the same subnet as the outside interface of your router. Your ISP should have provided you with details. It may be that you are using DHCP on the outside interface - do you know if that is the case ?

ii) if your LAN clients are using private address eg. 10.x.x.x, 172.16 - 31.x.x or 192.168.x.x then you will need to NAT these clients. You usually NAT them to the outside interface of your router

iii) DNS settings on the client. The client will need to have a DNS server(s) that they can use to resolve DNS names. These are often provided by the ISP.

I'll have a look for config docs for your device but in the meantime can you have a check to see if you have a default-route and NAT setup on the router ?

Jon

[Jon Marshall]

Chris

Just remembered about the Small Business forums. You may want to move this thread to the Small Business routers forum -

https://supportforums.cisco.com/community/netpro/small-business/routers

where you are more likely to find people who have experience with these routers.

Jon

[mcsnoogins]

Hi Jon,

Thanks for the speedy and friendly answer.

I have a sbs 2008 box running the dhcp for the network which handles everything for me. The DNS on the server is pointed at the router though. I can ping from all the machines. I definitley have not set up a default route though. Or atleast i haven't seen anything that mentions a default route. Is the default route another term for static route?

I can find the from the old router that is back in place (I'm assuming this is the ISP gateway address?)

In the Static route options (If that is the same as default route) i'm given the option of "Destination subnet" which i tried with the internal subnet which is 192.168.1.0 ( i know thats a hideous address range to use),  the subnet mask of 255.255.255.0 and the gateway of

That got me no where though.

I then tried to do the same using the external subnet which starts 239.x.x.x but when i type 239 into the first box i am told it cannot be used and i must use a number of 238 or lower.

Any ideas? Or have i just rambled on about the wrong thing?

Chris

[mcsnoogins]

Or should i move this over to the small business routers forum?

[Jon Marshall]

Chris

Nothing wrong with using 192.168.1.x, it's a common practice.

The default route is indeed a static route, it is simply a static route that is used when there is not a more specific route in the routing table. Think of it as a catchall route.

I'm having a look at the SRP500 admin guide as we speak. Have you seen this guide ?  I have attached it to this post.

Could you possibly select the WAN interface and then do a screenshot of the details. That should help identify if there is a default-route set ? You can upload files to a post by using the advanced editor.

NAT is also covered in the guide.

As for moving it, well you may get a better answer and a quicker resolution if you do move it. I have never used these devices so if you stick with me we could be spending a while trying to sort out something that some on those forums can answer straight away.

Don't worry, i won't be offended if you decide to move it

Jon

[mcsnoogins]

Thanks for that guide. I could only find a quick start

I've attached some screen shots to give you an idea of what i've been up to. I'm wondering if where i've set the router to static and set the ip address to the internal 192.168.1.1, should that actually be the external address that BT assigned to us?

[Jon Marshall]

Chris

You definitely don't need those 2 static routes as far as i can see.

It's not clear whether a default-route is automatically setup for you from the screenshots.

Perhaps you should setup NAT and then we can test. Also your DNS server cannot be set to the router, it needs to be a valid DNS server from the ISP.

Jon

[mcsnoogins]

Ah.

I'll get that sorted and run through setting up the NAT. Ill let you know how i get on.

Thanks for everything so far.
Chris

[mcsnoogins]

ummmmmm. I'm pretty mortified to tell you this Jon but it turns out the password was wrong

Turns out the first letter in the password is a capital and i was putting it in lowercase

I didn't notice as i'm used to logs saying CHAP authentication failed but i couldn't see that in the logs in this unit

Thank you very much for your help with this.

Chris

[Jon Marshall]

Chris

So is everything working correctly now ?

Jon

[mcsnoogins]

Yup