should SLIP support be removed?
Andy Green
andy at warmcat.com
Sat May 20 00:49:58 PDT 2006
Robert P. J. Day wrote:
>> If people are still using slip, possibly we should add that to busybox.
>>
>> What does it _do_?
>
> Serial Line Internet Protocol. Does everything that PPP does, except
> worse.
LOL well it does less than PPP, it's simpler and smaller. Basically
slattach is a usermode apps that manages / fakes up a link between a
network interface sl<n>, eg, sl0 and a physical serial port. The
logical link is "point to point", that is, there is exactly two IP
addresses involved, one at each end of the link. The sl<n> network
interface is externally told the IP of both ends of the link, and this
must match at the far end too.
Once you set up the far-end IP as the gateway for your routing, and the
far end is doing NAT, you have a nice solid serial port -based IP
network that exposes itself as a standard network interface object,
sl<n>. You can tcpdump what is on there, run whatever TCP services,
wget, etc.
It's not used much but in the multiprocessor case, which is where I am
using it, it allows you to leverage a boring serial port into the
Internet in a clean and lean way, at the price of configuration hassle.
But for the multiprocessor case the config action is a designtime one-off.
I don't know I would merge it into busybox unless there is more call for
it than from me, since I made an RPM[1] with slattach, the only thing I
would hate to happen is if SLIP powers were lost from busybox ifconfig.
-Andy
[1] It's still coming
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