Non-continuous wan subnet

Hi,
We are assigned some IP’s from our ISP, Subnetmask /27. Actualy 217.x.187.194-198 and from 217.x.187.203-213 The IP’s between are given to someone else. This should be 30 available hosts. GW 217.x.187.193
I will use the range 217.x.187.194-198 for my internal networks.
Question. Will there be a problem not having entire full subnet or is this possible on the ASA 5505? Or should I ask for a complete range?
Also, is there any possibility to do static nat through the asa and allow all traffic from IP 217.x.187.196 to another router on the inside. This router belongs to another company who needs to regularly open and close ports through to their company. we do not want to give out access to ASA.
Br
Fredrik

Hi,
If we are strictly talking about having the 2 subnets on the WAN interface of the ASA then that is no problem at all. Though you have to consider the fact that ASA can not have 2 different subnet configured on a single interface (in your case a Vlan interface). But there is a way to implement that, the second subnet just is not configured under any interface. The subnet and/or its IP addresses are only present on the ASA in its NAT configurations.
There is 2 ways you can handle this with your ISP
You can configure the other subnet between your ASA and the ISP Router and request the ISP to route the second subnet towards your ASAs WAN interface IP address (that belongs to the first subnet)
You can configure the other subnet between your ASA and the ISP can configure both of the subnet on their link towards the ASA. Even though the second subnet is not configured on your ASAs WAN interface you are able to configure NAT using the second subnets IP addresses on the ASA. In this case when traffic is incoming to the second subnet from the Internet the ISP router will send ARP requests for the second subnets IP addresses (as the ISP has the subnet as directly connected) and the ASA will respond to those ARP requests with its WAN interface MAC address IF there is a NAT configuration present. You will also have to make sure that the ASA is configured to answer to ARP requests on the WAN interface. If you were to go with this option then let us know the software the ASA is running and we can confirm what commands you need enabled/disabled.
To avoid any ARP related problems and other problems I would suggest that you ask the ISP to route the second subnet towards the ASA WAN IP address. Much more simple that way.
Now you mention that you want to do a Static NAT on the ASA for the internal router? This should be no problem and there should not be any problem allowing all traffic to the internal host when it has the Static NAT configured.
Since you have 2 public subnets you also have the option to configure the second public subnet directly on the internal interface of the ASA and the other company can use the public IP address directly on their Router. Naturally configuring this second subnet on the ASA might waste some public IP address (since you need one for the gateway etc.) but it completely depends on your setup.
Hope I made any sense :) Feel free to ask more if needed
- Jouni

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Pièces jointes :
graphique avec trou.jpg ‏31 KB
Communication protocol Serie30_V3.1_e.pdf ‏415 KB
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Bonjour, je ne peux pas regarder votre code car je n’ai pas installé LV2013 sur ma machine.
Mais quelques pistes et une explication possible des « trous » : des valeurs sont à NAN.
http://fr.wikipedia.org/wiki/NaN
En effet, si dans un tableau de nombre, vous notez « NAN » soit Not A number alors si vous voulez représenter le tableau dans un graphique LabVIEW, les NAN ne seront pas représentés. Donc des trous.
Peut-être que le NAN est causé dans votre code par une erreur de communication avec votre appareil. Par exemple si erreur alors dans le décodage de votre mesure retourne NAN.
Questions :
> Gérez-vous correctement les erreurs de communication avec l’appareil ?
> Avez-vous fait un export des données du graphique vers Excel pour « regarder » les valeurs ? (sur le graphique, clic droit exporter vers Excel)
Bonne continuation
A+
Luc Desruelle | Voir mon profil | LabVIEW Code & blog
Co-auteur livre LabVIEW : Programmation et applications
CLA : Certified LabVIEW Architect / Certifié Architecte LabVIEW
CLD : Certified LabVIEW Developer / Certifié Développeur LabVIEW

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Je vous joins mon vi pour que vous puissiez mieux cerner mon problème.
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Résolu !
Accéder à la solution.
Pièces jointes :
TriTableauPointsReference.vi ‏151 KB

Bonjour,
Les fonctions que vous souhaitez utiliser semblent intéressantes lorsque le
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être votre cas (10 à 20 ms). Vu que l’information temporelle ne vous intéresse
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Cordialement
Mathieu B
National Instruments France
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