[9fans] Plan 9 IPv4 router

[9fans] Plan 9 IPv4 router

[smiley]

Hi, all,

Does anybody know if it's possible to use Plan 9 as an IPv4 router?  I
know you can export the /net file system to other Plan 9 boxen, but I'm
wondering about using Plan 9 to create a network appliance/router.  I'm
envisioning using Plan 9 to do things that Linux iptables does... route
packets, NAT, rate limiting, etc.  Could you, for example, stick
Unix/Window$ boxen on a LAN and use a Plan 9 box as a gateway?  Is there
currently any way to do such a thing?

Re: [9fans] Plan 9 IPv4 router

[Sergey Zhilkin]

Hi !

Answer is simple - no.

But this doesn't mean that you can't use plan9 as a core technology
for router os ;)

Current IP stack doesn't support NAT (dirty hack was made by some
plan9 geek), rate limits and other useless features of lunix router.

Currently lunix router on a ugly and messy MIPSel platform makes his
job done well :)

And, I think, than in the era of IPv6 nobody will be interested in
something like NAT.

And, YES, Plan9 CAN route IP ! :)

2011/7/30  <smiley@icebubble.org>:
> Hi, all,
>
> Does anybody know if it's possible to use Plan 9 as an IPv4 router?  I
> know you can export the /net file system to other Plan 9 boxen, but I'm
> wondering about using Plan 9 to create a network appliance/router.  I'm
> envisioning using Plan 9 to do things that Linux iptables does... route
> packets, NAT, rate limiting, etc.  Could you, for example, stick
> Unix/Window$ boxen on a LAN and use a Plan 9 box as a gateway?  Is there
> currently any way to do such a thing?
>
>



-- 
С наилучшими пожеланиями
Жилкин Сергей
With best regards
Zhilkin Sergey

Re: [9fans] Plan 9 IPv4 router

[Lyndon Nerenberg (VE6BBM/VE7TFX)]

> Answer is simple - no.

> And, YES, Plan9 CAN route IP ! :)

You only get to choose one of the above.

Routing does not imply NAT.

Re: [9fans] Plan 9 IPv4 router

[Sergey Zhilkin]

> Routing does not imply NAT.

Hi ! I know that :) Routing != NATing :)

As far, as I know, there was some NAT work in Plan9. But I can't
remember... Sources of this work is on my work laptop :)

2011/7/31 Lyndon Nerenberg (VE6BBM/VE7TFX) <lyndon@orthanc.ca>:
>> Answer is simple - no.
>
>> And, YES, Plan9 CAN route IP ! :)
>
> You only get to choose one of the above.
>
> Routing does not imply NAT.
>
>
>



-- 
С наилучшими пожеланиями
Жилкин Сергей
With best regards
Zhilkin Sergey

Re: [9fans] Plan 9 IPv4 router

[David du Colombier]

> As far, as I know, there was some NAT work in Plan9. But I can't
> remember... Sources of this work is on my work laptop :)

https://hg.9grid.fr/plan9-nat/

I did a NAT implementation some times ago. It's working, but it's
still an early work and I haven't worked on it for few months.

It is implemented in ipifc, directly in the kernel IP stack.

I attempted different implementations as kernel devices or user
process, but I haven't achieved a satisfactory result yet.

This URL is the development repository and I should probably
extract a proper patch from it.

See the README file for more details.

I hope to have more time in the future to work on it.

--
David du Colombier

Re: [9fans] Plan 9 IPv4 router

[erik quanstrom]

> Does anybody know if it's possible to use Plan 9 as an IPv4 router?

plan 9 does a fine job of routing ip4 packets.  i used plan 9
to do that for a 4 months recently during a network renumbering.

if you do this, make sure you've made this revert to ip.c.  the
sources version has both lines, which is harmless but redundant.

minooka; diff -c /n/dump/2010/0930/sys/src/9/ip/ip.c /n/dump/2010/0820/sys/src/9/ip/ip.c
/n/dump/2010/0930/sys/src/9/ip/ip.c:463,469 - /n/dump/2010/0820/sys/src/9/ip/ip.c:463,469
  		}

  		/* don't forward to source's network */
- 		memset(&conv, 0, sizeof conv);
+ 		conv.r = nil;
  		r = v4lookup(f, h->dst, &conv);
  		if(r == nil || r->ifc == ifc){
  			ip->stats[OutDiscards]++;

- erik

Re: [9fans] Plan 9 IPv4 router

[Alexander Sychev]

[-- Attachment #1: Type: text/plain, Size: 725 bytes --]

On Sun, Jul 31, 2011 at 5:21 PM, erik quanstrom <quanstro@quanstro.net>wrote:

> > Does anybody know if it's possible to use Plan 9 as an IPv4 router?
>
> plan 9 does a fine job of routing ip4 packets.  i used plan 9
> to do that for a 4 months recently during a network renumbering.
>
> if you do this, make sure you've made this revert to ip.c.  the
> sources version has both lines, which is harmless but redundant.
>

- My car is broken, can you fix it?
- Pay me $100, I will kick your car and it will be fixed...
- Do you think I'm going to pay $100 for one kick?
- No, you will pay only $1 for the kick, but $99 for a knowledge, where
exactly I should kick the car

:-)

--
Best regards,
santucco

[-- Attachment #2: Type: text/html, Size: 1118 bytes --]

Re: [9fans] Plan 9 IPv4 router

[smiley]

erik quanstrom <quanstro@quanstro.net> writes:

>> Does anybody know if it's possible to use Plan 9 as an IPv4 router?
>
> plan 9 does a fine job of routing ip4 packets.  i used plan 9
> to do that for a 4 months recently during a network renumbering.
>
> if you do this, make sure you've made this revert to ip.c.  the

<snip>

OK, cool.  How is packet forwarding turned on/off?  (Or is it always
"on"?)

How do you specify the routing rules?  Somewhere in the NDB?

Re: [9fans] Plan 9 IPv4 router

[David du Colombier]

> OK, cool.  How is packet forwarding turned on/off?  (Or is it always
> "on"?)

echo iprouting >/net/ipifc/clone

> How do you specify the routing rules?  Somewhere in the NDB?

For example, to route to network 192.168.1.0/24 via 192.168.0.1:

echo add 192.168.1.0 255.255.255.0 192.168.0.1 >/net/iproute

See ip(3) for more details.

--
David du Colombier

Re: [9fans] Plan 9 IPv4 router

[David du Colombier]

> This URL is the development repository and I should probably
> extract a proper patch from it.

I put the patches in /n/sources/contrib/djc/nat.

It doesn't need IL, but IL is supported. That's why
the IL patches are included. You can remove the IL
parts if not needed.

--
David du Colombier

Re: [9fans] Plan 9 IPv4 router

[erik quanstrom]

On Sun Jul 31 13:53:48 EDT 2011, 0intro@gmail.com wrote:
> > OK, cool.  How is packet forwarding turned on/off?  (Or is it always
> > "on"?)
>
> echo iprouting >/net/ipifc/clone
>
> > How do you specify the routing rules?  Somewhere in the NDB?
>
> For example, to route to network 192.168.1.0/24 via 192.168.0.1:
>
> echo add 192.168.1.0 255.255.255.0 192.168.0.1 >/net/iproute
>
> See ip(3) for more details.

see also ipconfig(8).

- erik