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Virtual Router

 
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Oracle Java
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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??

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