Date: Mon, 21 Oct 2002 12:01:24 -0700 (PDT) From: "Dmitry Y. Bordakov" <dmitry_bordakov@agilent.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/44355: After deletion of an IPv6 alias, the route to the whole subnet is removed too. Message-ID: <200210211901.g9LJ1ObS006867@www.freebsd.org>
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>Number: 44355
>Category: kern
>Synopsis: After deletion of an IPv6 alias, the route to the whole subnet is removed too.
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Oct 21 12:10:01 PDT 2002
>Closed-Date:
>Last-Modified:
>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
...
>Fix:
begin 644 in6.c.diff
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M"7!F>&QI<W1?;VYL:6YK7V-H96-K*"D[#0H@"0E]#0HK#0H@"0EB<F5A:SL-
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M861D<F5S<R!D;V5S(&YO="!O8F5Y(&%U=&]C;VYF(&%N9"!T:&5R92!I<R!N
M;PT*(`D)("H@("`@;W1H97(@;W=N97(@;V8@=&AE('!R969I>"X-"B`)"2`J
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M#0HK"0D):68@*"@H:6$M/FEA-E]F;&%G<R`F($E.-E])1D9?05543T-/3D8I
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M"BL)"0D@("`@("@H:6$M/FEA-E]F;&%G<R`F($E.-E])1D9?05543T-/3D8I
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M"BL)"0D)<'(M/FYD<')?97AP:7)E(#T@,3L@+RH@6%A8.B!J=7-T(&9O<B!E
M>'!I<F%T:6]N("HO#0HK"0D)?0T*(`D)?0T*(`T*(`D@('!U<F=E861D<CH-
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*#0H@"7T-"B`-"@``
`
end
begin 644 in6_ifattach.c.diff
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M#0HM"0EI9B`H*&5R<F]R(#T@;F0V7W!R96QI<W1?861D*"9P<C`L($Y53$PL
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7"0T*(`ER971U<FX@,#L-"B!]#0H@#0H`
`
end
>Release-Note:
>Audit-Trail:
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