How to configure ppp to support IPv6

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http://serverfault.com – I need to setup pppoe server for IPv6 on linux machine with RHEL 6.1. When I tried to start pppd,the output as following: ~$ sudo pppd start pppd:in file /etc/ppp/options:unrecognized option 'ipv6' Here is content of /etc/ppp/options file: local ipv6 ipv6cp-use-ipaddr As the man document,the option 'ipv6' should be recognized. IT puzzled me.Iam not sure how to config the pppoe server to surpport IPv6 PPP conections now. pppd man page Help! Thx VM~ (HowTos)