Replacing ISP managed router in office

Replacing ISP managed router in office
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Subject Author Date
Replacing ISP managed router in office smokejo 11-29-2006
Posted by on November 29, 2006, 2:09 pm
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Hi,

We are running the following topology

- 'Demarc' - CSU/DSU - Cisco 2501 Router - Cisco PIX Firewall - 3 x
Cisco 2950's - Users/Servers

At the moment, the router is managed by the ISP for a high monthly fee.
We are looking into the possibility of managing ourselves.

Am I correct in thinking that the 2501 router will basically advertise
our network and also have a default route to the ISP's edge router? For
instance;

eigrp 2
network 62.0.0.0 255.0.0.0
ip default-network 217.124.1.0 255.255.255.252 [assuming this is the
link between the Cisco router and the ISP's edge router]

Out of curiosity, what is the general routing protocol used between the
router at a client's site and the ISP's edge router?

Thanks in advance.


Posted by Wil Schultz on November 29, 2006, 2:17 pm
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Usually the routing to your ISP will be static unless you are dual homed
and have more than one ISP or you have your own AS and address space.

You can usually call your ISP and they can (more than likely) walk you
through the setup.


-Wil

smokejo@googlemail.com wrote:
> Hi,
>
> We are running the following topology
>
> - 'Demarc' - CSU/DSU - Cisco 2501 Router - Cisco PIX Firewall - 3 x
> Cisco 2950's - Users/Servers
>
> At the moment, the router is managed by the ISP for a high monthly fee.
> We are looking into the possibility of managing ourselves.
>
> Am I correct in thinking that the 2501 router will basically advertise
> our network and also have a default route to the ISP's edge router? For
> instance;
>
> eigrp 2
> network 62.0.0.0 255.0.0.0
> ip default-network 217.124.1.0 255.255.255.252 [assuming this is the
> link between the Cisco router and the ISP's edge router]
>
> Out of curiosity, what is the general routing protocol used between the
> router at a client's site and the ISP's edge router?
>
> Thanks in advance.
>

Posted by on November 29, 2006, 2:50 pm
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Wil Schultz wrote:

> Usually the routing to your ISP will be static unless you are dual homed
> and have more than one ISP or you have your own AS and address space.
>

Thanks Wil.

Their router will need a static route to our external address range,
but since we are using their router as a default route to the internet,
our router won't have any static routes configured, just the default
route, am I correct? Because the connection between our router and
their router is a direct one, this will show up as 'directly
connected', hence no need for a static route to them?

I will give them a call tomorrow and see what they saw too.


Posted by Brian V on November 29, 2006, 6:10 pm
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>
> Wil Schultz wrote:
>
>> Usually the routing to your ISP will be static unless you are dual homed
>> and have more than one ISP or you have your own AS and address space.
>>
>
> Thanks Wil.
>
> Their router will need a static route to our external address range,
> but since we are using their router as a default route to the internet,
> our router won't have any static routes configured, just the default
> route, am I correct? Because the connection between our router and
> their router is a direct one, this will show up as 'directly
> connected', hence no need for a static route to them?
>
> I will give them a call tomorrow and see what they saw too.
>

Only thing your router needs is a default route pointing to them ( 0.0.0.0
0.0.0.0 X.X.X.X). There exceptions to that rule, i.e. if you have more than
one subnet you will need additional routes. Ask your ISP for a copy of your
config as it is now, most of them will give it to you. If they ask why, tell
them you are having a security audit done and require a copy for the
records.



Posted by Wil Schultz on November 29, 2006, 8:36 pm
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+1

Or grab yer console cable and go break into it

-Wil

Brian V wrote:
>> Wil Schultz wrote:
>>
>>> Usually the routing to your ISP will be static unless you are dual homed
>>> and have more than one ISP or you have your own AS and address space.
>>>
>> Thanks Wil.
>>
>> Their router will need a static route to our external address range,
>> but since we are using their router as a default route to the internet,
>> our router won't have any static routes configured, just the default
>> route, am I correct? Because the connection between our router and
>> their router is a direct one, this will show up as 'directly
>> connected', hence no need for a static route to them?
>>
>> I will give them a call tomorrow and see what they saw too.
>>
>
> Only thing your router needs is a default route pointing to them ( 0.0.0.0
> 0.0.0.0 X.X.X.X). There exceptions to that rule, i.e. if you have more than
> one subnet you will need additional routes. Ask your ISP for a copy of your
> config as it is now, most of them will give it to you. If they ask why, tell
> them you are having a security audit done and require a copy for the
> records.
>
>

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