On up-to-date RHEL5 or CentOS5 (currently that means 5.10 aka 5U10)
Add the following line to /etc/sysctl.conf:
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net.ipv6.conf.all.disable_ipv6 = 1
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On a live system you can disable it with:
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echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
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