Virtual Router

[Roger Fed]

Hello,
During my search about Graduation Project Ideas I found an idea about Virtual Router
I know that there exist a virtual router in windows7 and it works well but when searching about virtual router
in Linux i found the following:

"In Linux there is a Kernel level router but on configuring in kernel level will cause some curious problems so we can do software router in user level"

I've no experience in Linux so, i want to understand the nature of these problems???
and what is the different between kernel level and user level ???
and is it a beneficial idea to develop a virtual router working in Linux in a user level??

[Ernest Friedman-Hill]

It would help if you told us where that quote came from. Already, the grammar doesn't fill me with confidence.

[Tim Holloway]

Ernest Friedman-Hill wrote:It would help if you told us where that quote came from. Already, the grammar doesn't fill me with confidence.

As does the fact that I've been using kernel-level routing (via IP forward) on my production servers since about 1996 with no problems. Not to mention the IPtables-based routing that my VMs have been using for around 3 years or so.

[Ernest Friedman-Hill]

Tim Holloway wrote:
As does the fact that I've been using kernel-level routing (via IP forward) on my production servers since about 1996 with no problems. Not to mention the IPtables-based routing that my VMs have been using for around 3 years or so.

Yeah, I have two servers in production that use iptables to run Tomcat on port 80 as non-root; they're been running forever.