ISP managed router between internet and firewall.. Advantages?

[shakamon]

Why would it be advantageous to have managed internet router between the internet ISP and your Pix firewall?

We are being offered a managed service that comes with an internet router, but we would have no access to it. In short it is way cheaper.

Currently we have a GRE VPN between sites. We also wish to use this GRE VPN to fail VOIP onto in the future as well. We manage our own router now. I cant think of any reasons why not to switch over. I dont like the idea of not being able to control this router, but I can put my security on my PIX external interface.

Can someone enumerate the reasons why it is bad to have a managed router and not control this system between the firewall and the internet?

"Only the dead fish follow the stream"

 

[lgarner]

In short it is way cheaper."

There's your advantage. I can't think of a reason not to, either. You can either buy the router, pay for maintenance & support, monitor and administer it, or.... not.

I would want control of the firewall, but everything on the outside of that should be considered hostile anyway.

 

[MTandSAV]

just make sure you've a clear SLA with your ISP in case the router goes down.
I heard one story of a hotel (in Germany) that had an ISP managed router onsite and they were being charged per transmitted byte (from isp to isp managed router onsite). I still wonder how this hotel could check this as they also had no access to the router, so that ISP could charge anything they want.

CCNA, CCNP..partly