Re: Couple of Lisp hacks

Luke Gorrie <[email protected]> writes:

> One's a TCP/IP network stack built on Ethernet (Linux 'tap' devices).
> It has minimal implementations of ARP, IP, ICMP, and TCP. It can
> answer pings, and go through the motions of establishing TCP
> connections and reading/buffering/acknowledging data. The URL is
> http://sf.net/projects/slitch/

The nice thing about formus like this is they prod you into actually
doing stuff, so that you can show it off. :-)

This weekend I hacked some new features into Slitch: the concept of
network "interfaces", IP routing, and some netstat-like diagnostic
functions. The fun part is routing, because now Slitch can talk to the
internet via its host.

I prepared a fun little screenshot:

  * (netstat)
  lisp0  UP    Type:TAP  HWaddr 00:FF:C5:50:B6:E4
         Inet addr:192.168.43.10/255.255.255.0  Bcast:192.168.43.255
         RX bytes:3433868 (3.4MiB)  TX bytes:3418024 (3.4MiB)>

  lisp1  DOWN  Type:TAP  HWaddr 00:FF:6B:5D:36:60
         Inet addr:0.0.0.0/0.0.0.0  Bcast:0.0.0.0
         RX bytes:0 (0 b)  TX bytes:0 (0 b)>

  * (show-tcp-connections)
  #<TCP Stream 192.168.43.10:23 / 192.168.128.27:35614>: ESTABLISHED
  #<TCP Stream 192.168.43.10:80 / 192.168.43.1:34142>: ESTABLISHED

  * (routes)
  Destination      Gateway          Netmask          Interface
  192.168.128.43   0.0.0.0          255.255.255.255  lisp0
  192.168.43.0     0.0.0.0          255.255.255.0    lisp0
  192.168.128.0    192.168.43.1     255.255.255.0    lisp0

Happy hacking,
Luke