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Re: buying a router or using router in kernel

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On 2012-08-29, Simon Quantrill <simon.quantrill@gmail.com.invalid> wrote:
> On 2012-08-25 19:03:16 +0000, david nnaemeka said:
>
>> Which is better, buying a router and learning a new set of commands or
>> using the router in the linux kernel?
>> I really don't know what considerations one has to outline for making a
>> decision. Can anyone give me some and point to what direction is
>> simpler, cost effective and qualitative?
>> tnx
>
> They are both the samething routing in linux kernel and routing on a 
> router is practially the same thing.

It's true only for SOHO routers.

In linux box decision how to handle incoming packet is made by kernel
code. It depends on data provided by various userspace daemons which set 
routing table and firewall rules. At the time software(kernel included)
eats all its resources(heavy trafic, ddos, etc.) kernel don't have
a chance to run "routing code". Often there are problems even in lower
layer - linux cannot handle getting packets from interface when there is
a lot of inbound packets. There was some enhancements in networking 
kernel code last years, but its still fully software based. I think
it will always be in desktop machines since they have no specialized
routing hardware.

In enterprise class routers there is a feature called forwarding plane
and control plane separation. Decision on packet handling is made by
piece of hardware which is autonomous. Control plane is "programming"
forwarding plane but if control plane is busy(lot of new routing
information) or even dead packets are still following already programmed
routes. Same for firewall rules, but only in high-end equipment.

-- 
Regards
orcus

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Thread

buying a router or using router in kernel david nnaemeka <odimegwudavid@yahoo.fr> - 2012-08-25 20:03 +0100
  Re: buying a router or using router in kernel Dan C <youmustbejoking@lan.invalid> - 2012-08-25 23:27 +0000
    Re: buying a router or using router in kernel Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-08-26 06:01 +0000
      Re: buying a router or using router in kernel Peter Köhlmann <peter-koehlmann@t-online.de> - 2012-08-26 09:44 +0200
  Re: buying a router or using router in kernel Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2012-08-25 19:31 -0500
  Re: buying a router or using router in kernel General Schvantzkoph <schvantzkoph@yahoo.com> - 2012-08-27 17:11 +0000
    Re: buying a router or using router in kernel Dave <dave@llondel.org> - 2012-08-27 20:08 +0100
    Re: buying a router or using router in kernel Whiskers <catwheezel@operamail.com> - 2012-08-27 21:56 +0000
      Re: buying a router or using router in kernel Stefan Monnier <monnier@iro.umontreal.ca> - 2012-08-29 10:36 -0400
  Re: buying a router or using router in kernel telsar <noone@nowhere.com> - 2012-08-27 16:59 -0500
  Re: buying a router or using router in kernel Simon Quantrill <simon.quantrill@gmail.com.invalid> - 2012-08-29 16:52 +0200
    Re: buying a router or using router in kernel orcus@pwr.wroc.pl - 2012-08-29 16:55 +0000
      Re: buying a router or using router in kernel Simon Quantrill <simon.quantrill@gmail.com.invalid> - 2012-08-29 23:37 +0200

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