Date: Mon, 31 Mar 2014 08:20:01 GMT From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/188032: IPv6 on lo never leaves 'tentative' state if configured with prefixlen 128 Message-ID: <201403310820.s2V8K1GK003103@freefall.freebsd.org>
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The following reply was made to PR kern/188032; it has been noted by GNATS. From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Darren Baginski <kickbsd@yandex.ru>, freebsd-gnats-submit@FreeBSD.org Cc: Subject: Re: kern/188032: IPv6 on lo never leaves 'tentative' state if configured with prefixlen 128 Date: Mon, 31 Mar 2014 12:11:14 +0400 > IPv6 on lo never leaves 'tentative' state if configured with prefixlen 128. > > Steps to reproduce. > > # ifconfig lo8 create > # ifconfig lo8 up > # ifconfig lo8 inet6 fc00::ff prefixlen 128 > > > # ifconfig lo8 > lo8: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> > inet6 fc00::ff prefixlen 128 tentative > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > > lo8 ipv6 stays 'tentative' stays forever and never become ping-able. > > "Workaround" is to apply any other prefixlen, e.g. /127 >> How-To-Repeat: > > # ifconfig lo8 create > # ifconfig lo8 up > # ifconfig lo8 inet6 fc00::ff prefixlen 128 > > > # ifconfig lo8 > lo8: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> > inet6 fc00::ff prefixlen 128 tentative > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > # ping fc00::ff >> Fix: > "Workaround" is to apply any other prefixlen, e.g. /127 Hello, Actually the problem is in your configuration. As you may see, you have IFDISABLED flag set. When you are configuring /127 prefix, the system does install route on that prefix and automatically clears IFDISABLED flag. When you are configuring /128 prefix, the system won't install route and thus IFDISABLED flag still here. With IFDISABLED flag the system won't do DAD and tentative flag will never cleared. -- WBR, Andrey V. Elsukov
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