Date: Sun, 18 Apr 2004 14:54:48 -0400 From: "Adam C. Migus" <adam@migus.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: current@freebsd.org Subject: Re: VLAN support in rcNG [PATCH] Message-ID: <1082314488.4082cef84d997@webservices.migus.org> In-Reply-To: <20040418183445.GA24308@Odin.AC.HMC.Edu> References: <1082233506.408192a2c476a@webservices.migus.org> <20040417235302.GC3534@Odin.AC.HMC.Edu> <20040417201913.P34536@sasami.jurai.net> <20040418005436.GC14645@Odin.AC.HMC.Edu> <1082258483.4081f43366454@webservices.migus.org> <20040418035435.GF14645@Odin.AC.HMC.Edu> <1082264575.40820bff559cd@webservices.migus.org> <20040418183445.GA24308@Odin.AC.HMC.Edu>
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Quoting Brooks Davis <brooks@one-eyed-alien.net>: > On Sun, Apr 18, 2004 at 01:02:55AM -0400, Adam C. Migus wrote: > > > > The software that I've seen that accepts `<interface>.<tag>' but > can't > > deal with it internally usually uses an `_' and it's pretty > standard > > however that's not going to work too well here either without > > complicating parsing inside rcNG which is one of the reasons I > avoided > > the whole issue by going with the `vlan<tag>' naming scheme on the > my > > other boxes and specifying the physical device. Having said that > and > > glancing at my keyboard I'm not sure I can think of other > delimiter > > that's not going to offend someone, if not sh(1). > > > > So I guess in summary I'm suggesting if the complexity of dealing > with: > > > > ifconfig_xl0_2="DHCP" # -> ifconfig xl0.2 vlandev xl0 vlantag 2 > > > > in rcNG is worth it then I think that's the only way this type > naming > > scheme is going to work. I'd be happy to write the parsing for it > if > > you like. > > There is little or no complexity depending on how you solve the > problem. > My proposal was to let the kernel support <interface>_<tag> which > would > require no modifications to the rc system. If you wanted to do it > in > the rc system, the equivalent of "tr . _" would have to be applied > to > the name before using the pseudo associative array lookup hack, > that's > it. The only difficulty is that you have to do it without anything > in > /usr. Doesn't sounds difficult, expr(1) is in /bin... :-) > > > But also, given there's that other defacto-standard naming scheme > of > > `vlan<tag>' it would be nice to support it and the only way to do > it, > > since specifiying the physical device explicitly is required, is > > something like my patch, on the surface. > > > > I couldn't comment much more without seeing your code which I'd > like to > > do if possible but all the same I'm guessing that it would be > fairly > > trivial to allow: > > > > cloned_interfaces="vlan2" # -> ifconfig <ifn>.2 vlandev <ifn> > vlantag 2 > > cloned_interface_vlan2_dev="xl0" # -> <ifn> required above > > > > Hmmm, this thread is making me wonder if it's time to think about > some > > kind of more functional, general abstraction for cloned interfaces > in > > rcNG which allows all the fun things people would want to do with > them, > > like DHCP just for starters, now. After-all whether or not you do > want > > to honor the `vlan<tag>' naming scheme this already looks like it > has > > to potential to get a little mucky too me... :-) > > Any attempt to make vlan# mean vlan<tag> by default will result in > much > pain and suffering. It would be a major POLA violation and it would > be > making the degenerate case of a single parent interface the default > which would break a whole lot of other valid configurations. > > -- Brooks > > -- > Any statement of the form "X is the one, true Y" is FALSE. > PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 > I agree. My interface, vlandev xl0, vlantag 2 is named vlan0... Hence my comment on the muckiness. All the same I do wish it supported the naming scheme in some fashion as it's still defacto-standard, not going away and easier to integrate. If it does end up being only `<interface>.<tag>' I'm sure I'll be able to deal with it. -- Adam C. Migus -- http://people.migus.org/~adam/
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