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Selecting network for Internet access

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  Selecting network for Internet access Clark Smith <noaddress@nowhere.net> - 2011-02-05 16:16 +0000
    Re: Selecting network for Internet access Jan Wideł <jwnews@_NOSPAM_debian.maszyna.pl> - 2011-02-05 18:20 +0100
    Re: Selecting network for Internet access Douglas Mayne <none@invalid.com> - 2011-02-05 18:09 +0000
    Re: Selecting network for Internet access Thomas Schmidt <bbeamer@gmx.de> - 2011-02-08 17:32 +0100
    Re: Selecting network for Internet access Max <nomail@forme.invalid> - 2011-02-07 22:38 +0100

#2354 — Selecting network for Internet access

	I know very little about networking so please bear with me.

	I have a Linux box M with two NICs. The first NIC is connected to 
network A, whereas the second NIC is connected to network B. Both 
networks have an Internet gateway. These gateways are totally independent 
from each other.

	Currently all Internet traffic on M is sent/received through 
network A. Can I dynamically select in M which of the A and B networks to 
use for Internet traffic? 

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#2378

Dnia 2011-02-05, o godz. 16:16:54
Clark Smith <noaddress@nowhere.net> napisał(a):

> 	I know very little about networking so please bear with me.
> 
> 	I have a Linux box M with two NICs. The first NIC is
> connected to network A, whereas the second NIC is connected to
> network B. Both networks have an Internet gateway. These gateways are
> totally independent from each other.
> 
> 	Currently all Internet traffic on M is sent/received through 
> network A. Can I dynamically select in M which of the A and B
> networks to use for Internet traffic? 

Yes.
1) any dynamic routing protocol, like RIP, OSPF ( the uplinks A and B
need support this)

or 

2) http://lartc.org/lartc.html#LARTC.RPDB.MULTIPLE-LINKS

-- 
Jasiek

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#2383

On Sat, 05 Feb 2011 16:16:54 +0000, Clark Smith wrote:

> I know very little about networking so please bear with me.
> 
> 	I have a Linux box M with two NICs. The first NIC is connected to
> network A, whereas the second NIC is connected to network B. Both
> networks have an Internet gateway. These gateways are totally
> independent from each other.
> 
> 	Currently all Internet traffic on M is sent/received through
> network A. Can I dynamically select in M which of the A and B networks
> to use for Internet traffic?
>
You might configure that setup for some form of "high availability" 
gateway to the internet using network B as a redundant link for network A 
(or visa versa). The idea is to monitor the link using network A and be 
prepared to switch to network B if network A fails. The elements which 
may need to be fixed up upon switching are the default route and name 
resolution. A simple script could perform the monitoring.

BTW, at first glance, using both networks seems like an attractive way to 
potentially double your bandwidth. Unfortunately, AFAIK, it is not 
possible to do that, especially without cooperation from network A and 
network B. Theoretically, it could be done, if they both agreed to watch 
for your packets and give them special marks of some sort to properly 
redirect them back to you. I imagine this is the technique that is used 
to bond some link-layer traffic together. For example, there are 
protocols for bonded ISDN, bonded T1, bonded DSL, etc. These are 
sometimes a viable option to incrementally add bandwidth. The downside is 
it can get pricey in a hurry.

-- 
Douglas Mayne

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#2390

Am 05.02.2011 20:42, schrieb The Natural Philosopher:
> Clark Smith wrote:
>>     I know very little about networking so please bear with me.
>>
>>     I have a Linux box M with two NICs. The first NIC is connected to
>> network A, whereas the second NIC is connected to network B. Both
>> networks have an Internet gateway. These gateways are totally
>> independent from each other.
>>
>>     Currently all Internet traffic on M is sent/received through
>> network A. Can I dynamically select in M which of the A and B networks
>> to use for Internet traffic? 
> 
> set default route
> 
> man route

You would probably also need to get a new ip address and dns server via
dhcp from the internet provider in the other network:

dhcpcd -n
(The command may vary according to your linux version)

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#2391

Op 5-2-2011 17:16, Clark Smith schreef:
> 	I know very little about networking so please bear with me.
>
> 	I have a Linux box M with two NICs. The first NIC is connected to
> network A, whereas the second NIC is connected to network B. Both
> networks have an Internet gateway. These gateways are totally independent
> from each other.
>
> 	Currently all Internet traffic on M is sent/received through
> network A. Can I dynamically select in M which of the A and B networks to
> use for Internet traffic?

Look for policy routing, Clark

-- 
Max

Open Source is an ode to common sense

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