Re: Two Network cards for redundancy

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

Guy,

 The third IP address must be configured in iNav and is created as a 
*VIRTUAL IP. You assign that address with a mask of 255.255.255.255. 
Then on the advanced tab you MUST check the Proxy Arp box and for 
performance you must assign the frame size to be the smaller of the two 
lines (in case one is 10/100 at 1492 and the other GbE at 8996 you must 
use the 1492).

 Once that is done you can start the interface and it will respond to 
PINGs etc.

 Then you will want to add Schowler routes to your network for each 
physical IP. The route specifies the destination as the network

example: for network 192.168.1.0 with physical address 192.168.1.10 do:

ADDTCPRTE RTEDEST('192.168.1.0')      
         SUBNETMASK('255.255.255.0') 
         NEXTHOP('192.168.1.10')     
         BINDIFC('192.168.1.10')     
         DUPRTEPTY(7)                

Repeat for the other physical.

NOTE: If one interface is GbE and the other is 10/100 you'll want a 
larger DUPRTEPTY for the GbE interface. Otherwise you'll want them to 
match. In NO CASE do you want to use priority of 5.

 - Larry

Guy Terry wrote:
> Hi all,
>
> The 520 we've got came with two ethernet cards, and as I understand they 
> were configured so that they both worked with the same IP address. This 
> to introduce redundancy in case one failed (and perhaps to spread the 
> load?). Then, when we restored our old system onto the 520, the network 
> config got broken and I just set it up with one network card.
>
> I'm going to have a go tomorrow at setting up the dual-card option 
> tomorrow, but I can't work out how. I guess that you give each ethernet 
> line it's own TCP/IP interface with a unique IP address, but I can't 
> find where to specify the third IP address - the IP address you want 
> both cards to 'pretend' to be. Can anyone help?
>
> Also, we have some fairly fancy HP switches - do I need to configure 
> them so that they know about this special setup?
>
> Cheers
>
> Guy
>
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