_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
01-20-2010, 09:05 PM
Les Mikesell
routing multiple network cards on a single subnet
On 1/20/2010 1:41 PM, Frank Cox wrote:
>
> On Wed, 2010-01-20 at 14:25 -0500, Bob Beers wrote:
>> On Wed, Jan 20, 2010 at 2:20 PM, Bob Beers<bob.beers@gmail.com> wrote:
>>> here's a link to a more thorough explanation:
>>>
>>> <http://www.cyberciti.biz/tips/configuring-static-routes-in-debian-or-red-hat-linux-systems.html>
>>
>> ok, last word from me on the subject, really,
>>
>> <http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Deployment_Guide/s1-networkscripts-static-routes.html>
>
> Looks like interesting reading. That's next on my list...
>
What's upstream? Two dsl lines from the same provider? Can you get
them provisioned on different subnets?
--
Les Mikesell
lesmikesell@gmail.com
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
01-20-2010, 09:08 PM
Robert Spangler
routing multiple network cards on a single subnet
On Wednesday 20 January 2010 13:57, Frank Cox wrote:
> On Wed, 2010-01-20 at 09:50 -0800, R-Elists wrote:
> > ummm, why do the two different networks need an IP on the same
> > subnet ?
>
> I have had a number of people ask me why I want this arrangement, where
> I have two modems on a single outbound subnet.
>
> This is (going to be) a server with limited upload bandwidth. By having
> two outbound connections, I can use a round robin dns entry to share the
> load between the two connections and increase my capacity.
Please be aware that DNS was not designed to do what you are doing. Yes it
will do a round-robin but is not connection aware. Lose a link and you lose
half of the connections even though one link is still active.
--
Regards
Robert
Linux User #296285
http://counter.li.org
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
01-20-2010, 09:14 PM
Les Mikesell
routing multiple network cards on a single subnet
On 1/20/2010 4:08 PM, Robert Spangler wrote:
> On Wednesday 20 January 2010 13:57, Frank Cox wrote:
>
>> On Wed, 2010-01-20 at 09:50 -0800, R-Elists wrote:
>> > ummm, why do the two different networks need an IP on the same
>> > subnet ?
>>
>> I have had a number of people ask me why I want this arrangement, where
>> I have two modems on a single outbound subnet.
>>
>> This is (going to be) a server with limited upload bandwidth. By having
>> two outbound connections, I can use a round robin dns entry to share the
>> load between the two connections and increase my capacity.
>
> Please be aware that DNS was not designed to do what you are doing. Yes it
> will do a round-robin but is not connection aware. Lose a link and you lose
> half of the connections even though one link is still active.
That depends on how the client reacts. Browsers generally are sensible
and if DNS returns multiple IP's where some don't respond, will retry
the connection with the others. Most other things aren't that bright.
--
Les Mikesell
lesmikesell@gmail.com
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
01-20-2010, 09:38 PM
Frank Cox
routing multiple network cards on a single subnet
On Wed, 2010-01-20 at 17:08 -0500, Robert Spangler wrote:
> Please be aware that DNS was not designed to do what you are doing.
> Yes it
> will do a round-robin but is not connection aware. Lose a link and
> you lose
> half of the connections even though one link is still active.
I'm aware of that, but it's a limitation I can live with for this
application. The whole thing is more of a "nice to have" than anything
that's actually mission critical.
_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
01-20-2010, 09:45 PM
Frank Cox
routing multiple network cards on a single subnet
On Wed, 2010-01-20 at 16:05 -0600, Les Mikesell wrote:
> What's upstream? Two dsl lines from the same provider?
Cable, actually.
> Can you get them provisioned on different subnets?
If I really had to I probably could; I have another modem in this same
building from them that I've had for a while and it's on a different
subnet, though everything comes in off of the same pole in the alley.
These latest two got their own separate wire pulled back to the pole
hookup, though, so I'm not entirely sure of what the ramification of
that is.
It seems to be a moot point now, though, as the routing solution I
posted earlier appears to be working wonderfully.
routing multiple network cards on a single subnet
