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network buffers

Configure Linux As Bastion Host

What is bastion host? How do I configure bastion host under Linux? How do I create a firewall for a bastion host under any Linux distribution?
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Linux Tune Network Stack (Buffers Size) To Increase Networking Performance

I've two servers located in two different data center. Both server deals with a lot of concurrent large file transfers. But network performance is very poor for large files and performance degradation take place with a large files. How do I tune TCP under Linux to solve this problem?
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