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ipv4 and ipv6

I'm getting slow DNS response from ssh and other network related traffic with delay of 30-60+ seconds per connection. All of our servers are behind hardware based dedicated firewall. My RHEL v6.1 server system running on HP hardware. How do I fix this problem?
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How do I configure IPv6 networking under nginx? How do I assign and use an IPv6 address under nginx web server? How do I enable IPv6 Support in nginx?
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Q. How do I configure IPv6 Tunnel under Ubuntu Linux? I'd like to browse and use IPv6 utilities under Ubuntu but my ISP is not ready with IPv6 native transport. How do I browser IPv6 ready websites using IPv4?
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OpenBSD Set / Change Default Gateway

Q. How do I change or set a default gateway under OpenBSD operating system?
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OpenBSD Change, Add or Display Default Gateway

How do I change existing openbsd gateway (openbsd routing) IP address? How do I see current routing table under OpenBSD?
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