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Beginner

ISA500 series as a gateway device

We have a few sites round and about that we're looking to upgrade to internet leased lines. Normally we'd stick something like an 881 or a 1921 router with the -SEC on the end but looking at the Ciso positioning for these devices they're rated throughput when you use nat'ing & VPN is much lower than the line speed. The ISA570 is rated at higher throughput for both IMIX & VPN than the low end ISR devices.

Is it feasible to put the ISA direct on the line termination without a dedicated router, most of these instances have no need for intersite routing and no need for advanced features from IOS.

Thanks in advance.

2 REPLIES 2
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Cisco Employee

Hi David,

Are you talking about connecting the ISA to a cable modem or DSL modem?  If so, that should be fine.  I have one setup that is connected to the cable modem.  You shouldn't need to have a router in front of the ISA as long as you can connect to the upstream device with ethernet.

Let me know if that answers your question.

Thanks,

Brandon

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Hi Brandon,

It would be for WAN connections where an ethernet terminator is presented, so Leased Lines or EFM (in the UK). So there is no modem or routing device provided by the carrier, they just give you an RJ45 socket.

Thanks.