Is it possible ...... ASA5550 Network Object

Answered Question
Aug 13th, 2010
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Hi all


I have looked around for the answer for a while now with no luck!!


I have two ASA5550 running v8.3.1 which i am installing to replace some real old legacy firewalls.


I want to be able to (if possible) create a Network Object which utilises a hostname as opposed to a IP adress and have the box dynamically work out the IP Address.

We have a number of services that could use this feature but here is one example.


BES server needs to talk to RIM on port 3101 at srp.uk.blackberry.net. If i query srp.uk.blackberry.net i will get an IP address returned but this can change. Now RIM documentation recommends not to use a static IP address in firewall config for this reason. Not so much of an issue for BES as even when the IP does change the old one will remain active. However this could be another site and it may be the case that they take down the old IP address thus making the rule entry invalid until changed.


I really hope someone can assist me with this.


Cheers all


Chris

Correct Answer by Nagaraja Thanthry about 6 years 9 months ago

Hello,


At present, it is not possible to use DNS names in the

objects/object-groups/access-lists. You do need to specify the IP addresses

in each of them.


Regards,


NT

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balajirajahpb Fri, 08/13/2010 - 05:18
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Dear Chris Griffin,

For BES Traffic open the outbound traffic TCP-3101 for the following RIM network


206.51.26.0 / 24 Netmask = 255.255.255.0

193.109.81.0 / 24 Netmask = 255.255.255.0

204.187.87.0 / 24 Netmask = 255.255.255.0

216.9.240.0 / 20 Netmask = 255.255.240.0

206.53.144.0 / 20 Netmask = 255.255.240.0

67.223.64.0 / 19 Netmask = 255.255.224.0

93.186.16.0 / 20 Netmask = 255.255.240.0

68.171.224.0 / 19 Netmask = 255.255.224.0


Regards

Balajirajah P B

balajirajahpb Fri, 08/13/2010 - 05:20
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Dear Chris,


Please open access on Port 3101 from BES Server the following source to destinations  listed below


Destinations:
206.51.26.0 / 24    Netmask = 255.255.255.0
193.109.81.0 / 24  Netmask = 255.255.255.0
204.187.87.0 / 24  Netmask = 255.255.255.0
216.9.240.0 / 20    Netmask = 255.255.240.0
206.53.144.0 / 20  Netmask = 255.255.240.0
67.223.64.0 / 19    Netmask = 255.255.224.0
93.186.16.0 / 20    Netmask = 255.255.240.0
68.171.224.0 / 19  Netmask = 255.255.224.0


Regards

Balajirajah P B

Correct Answer
Nagaraja Thanthry Fri, 08/13/2010 - 06:50
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  • Cisco Employee,

Hello,


At present, it is not possible to use DNS names in the

objects/object-groups/access-lists. You do need to specify the IP addresses

in each of them.


Regards,


NT

ceige6542 Fri, 08/13/2010 - 21:19
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Thanks for your advise.


Does anyone know if this will be in upcoming software releases?


Cheers

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