Date: 14 Aug 1995 18:13:55 +0800 From: peter@haywire.dialix.com (Peter Wemm) To: freebsd-current@freebsd.org Subject: Re: ioctl(SIOCAIFADDR): File exists Message-ID: <40n7l3$ft6$1@haywire.DIALix.COM> References: <40mduf$fvb$1@haywire.DIALix.COM>, <199508140542.HAA11158@uriah.heep.sax.de>
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j@uriah.heep.sax.de (J Wunsch) writes:
>As Peter Wemm wrote:
>>
>> There was a "feature" in 2.0.5 that meant that the local address of a
>> point-to-point link could not be within the same network as any other
>> interface, with the local subnet size being decided by the netmask of
>> the remote network.
>This sounds like it could be it (even though it's surprising that i
>can log into the machine succesfully using another address, while i've
>always been unsuccesful with the same address -- the other address has
>been just 4 above).
Essectially, it becomes non-deterministic.. It depends on the
ordering of the routes and the interface lists.. I never really
figured out exactly what the variables were, I just nuked the
problem.. :-)
>> There is an undocumented option in the kernel, called something like
>> P2P_LOCALADDR_SHARE, which works around the problem (with a slight
>> bug) after I made a lot of noise about this "feature" before 2.0.5 was
>> released.
>What's the `slight bug'? Can we use it nevertheless?
In one of the #ifdef cases, I accidently typed
if (ifp->if_flags & IFF_POINTOPOINT)
if (equal(addr, ifa->ifa_addr))
^^^^^^^^ Should be ifa_dstaddr!
return (ifa);
It doesn't have any affect, except possibly if you have aliases on
your PPP link.. in which case, connecting to a remote address could
choose the wrong local address - but that's not much different to the
original code, so it's marginally better, not worse. (better, because
netmasks are not applied).
Cheers,
-Peter
>--
>cheers, J"org
>joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/
>Never trust an operating system you don't have sources for. ;-)
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