Cisco router

We have a new fiber connection for our company that sports 100 Mbps and I'm looking to upgrade the existing router to handle the increased bandwidth. We currently have a Cisco 1841 that only will do about 35 Mbps. I'm a little familiar with routers but not enough to feel comfortable making the final decision (without asking) on what the best one would be to accommodate 100 Mbps and security. Our current configuration does aaa authentication easyVPN , crypto pki certicate, port forwarding and ACL lists.

I've looked at the 1941's and 2951's but I don't understand the difference between SEC/K9 and ISR enough to make a decision without some help.

Can anyone recommend a good Cisco router to replace the 1841 and maybe explain the differences of SEC/K9 and ISR?
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Types of router
ISR - integrated services routers

Licence types
IPBaseK9 - Base IP license
SECK9  - Security license
UC - Unified Communication
DATA - Service Provider Services

Details on license details

You can use this to point you to right direction, but before you go to router speed on WAN port read intro of document first.
Cisco routers WAN speed comparation
Then think about your needs and available budget.
jmac44Author Commented:
Predrag, Thank you for your input.

I know what ISR stands for and the SEC refers to security. What I don't know is what an integrated service router is used for and do I need it. This also for SEC.

I have the router performance PDF, this is how I knew to look at the 1941 and 2951.

I'm hoping that someone can answer my questions and give me some advice in simple terms and not just provide internet links. With all do respect friend I can look information on the internet but I chose to come here and ask the question.

Thanks again.
ISR is multi-functional device that has hardware support for some function beside routing (hardware-based VPN, WLC, DSP, IPS, Content Filtering, Firewall etc).
On ISRs is installed universal IOS (software) with activated specific set of functions on router (IPbase, SEC etc)
For specific functions that you get with type of license you have list of functions on the first link.
SecK9 - . IKE v1 / IPsec / PKI, IPsec/GRE, Easy VPN w/ DVTI, DMVPN, Static VTI, Firewall, Network Foundation Protection,GETVPN etc.
Also on the same link you have
Migration to Simplified packaging on Next Generation ISRs
a kinda link between new IOS names and previous IOS names for functions (if you are familiar with those). So, SEC functions you will not have if IOS with IPBASE image is active. With SEC active you have IPBASE functions + SEC functions, and of course you need to pay for it.
And here is another link :)
Full list what you get when you pay SEC license. If you don't need any of those, don't pay for it, go with IPBASE license (if you ever need those you can upgrade later).
The reason for links is - to explain functions that router have with specific license type and Cisco licensing. I would do a much of copy-paste anyway, and worse, there is no easy way to explain it or recommend router. For me buying Cisco device on ebay is pain, I search through links for hours to make sure that Cisco device has all that I need, and yet few times I overlooked something and bought device that doesn't have function that I expected to be there. Difference between 1941 and 2951 (or any  other  router) can be irrelevant for your network needs, on the other hand some minor difference could be significant, but I can't  know your exact needs, so I can only  point you where you can find details that I believe are important from my experience (and relevant to your question).

I hope that this is helpful and I wish you all the best of luck with your purchase.

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And, BTW, Cisco 1841 can do much more than 35Mb that's why I point you to read document intro, 35 Mb is 75,000 packets per second with 64bytes packets size (standard max packet size is 1500bytes). Here you have subject where 1811 with standard packet size reaches 69Mbps. Sure, ACLs, VPN etc will slow it down, but that depends on what exact functions router will perform.

But still, for speed over 50Mb I would most likely go for some G2 ISR. My point here is that in the light of previous details you can expect 1941 router can perform much above 153 Mb presented in document since throughput in document is measured with 64Kb packets.
jmac44Author Commented:
Thank you for your help. I appreciate the detail and the time you took to answer my question. :)
You're welcome.
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