Date: Mon, 21 Oct 2002 12:20:02 -0700 (PDT) From: Peter Pentchev <roam@ringlet.net> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/44355: After deletion of an IPv6 alias, the route to the whole subnet is removed too. Message-ID: <200210211920.g9LJK2gA085050@freefall.freebsd.org>
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The following reply was made to PR kern/44355; it has been noted by GNATS. From: Peter Pentchev <roam@ringlet.net> To: "Dmitry Y. Bordakov" <dmitry_bordakov@agilent.com> Cc: bug-followup@FreeBSD.org Subject: Re: kern/44355: After deletion of an IPv6 alias, the route to the whole subnet is removed too. Date: Mon, 21 Oct 2002 22:13:37 +0300 On Mon, Oct 21, 2002 at 12:01:24PM -0700, Dmitry Y. Bordakov wrote: > > >Number: 44355 > >Category: kern > >Synopsis: After deletion of an IPv6 alias, the route to the whole subnet is removed too. > >Originator: Dmitry Y. Bordakov > >Release: 4.4-RELEASE > >Organization: > Agilent Technologies, Inc. > >Environment: > FreeBSD qar1 4.4-RELEASE FreeBSD 4.4-RELEASE #14: Fri Oct 11 19:55:37 GMT 2002 root@qar1:/usr/src/sys/compile/QAR44GENERIC.znb i386 > > >Description: > You configured several IPv6 aliases in one subnet (with the same prefix) on one network interface, for example, 3ffe::1, 3ffe::2, 3ffe::3, etc, all on fxp0. > During the first alias configuration, the network stack automatically configured an appropriate route to the network, in our example, 3ffe::/64 -> link#1 . > Deletion of one of the aliases causes deletion of the route and, therefore, unreachability of the remote addresses in the same subnet, for example, ping6 3ffe::123 returns "No route to host". > > >How-To-Repeat: > ifconfig lo0 inet6 add 3ffe::1 > ifconfig lo0 inet6 add 3ffe::2 > netstat -nr | grep lo0 > ... > 3ffe::/64 fe80::1%lo0 Uc lo0 > 3ffe::1 link#2 UHL lo0 > 3ffe::2 link#2 UHL lo0 > ... > ifconfig lo0 inet6 delete 3ffe::1 > netstat -nr | grep lo0 > ... > 3ffe::2 link#2 UHL lo0 > ... Is there a reason for you not to set a prefixlen 128 on each alias, just as you are supposed to set a netmask of 0xffffffff on each IPv4 alias in the same subnet as another address on the interface? Could you try setting a prefixlen 128 on all aliases except for the "primary" address (yeah, yeah, I know.. but it helps to talk of a "primary" address sometimes), and check if the problem persists? G'luck, Peter -- Peter Pentchev roam@ringlet.net roam@FreeBSD.org PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 B68D 1619 4553 I am not the subject of this sentence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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