Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
Unable to connect to an Interface assigned with a public IP address on Cisco ASAv in Azure
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Devildoc007
1
Reputation point
Hello,
I have a Cisco ASAv network virtual appliance in Azure configured with 4 different interfaces. Two of the interfaces are configured with a public IP address. However, only one of the interfaces can be accessed from the Internet. The other interface cannot be accessed from the Internet. The two interfaces are properly attached to the configured Network Security Group. All route tables look correct, but yet, I can only connect to one of the interfaces. Event logs from the Cisco ASAv indicates that route fails to locate next hop for the not-working interface. Any help is greatly appreciated. Thanks.
JD
Azure Virtual Network
{count} votes
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GitaraniSharma-MSFT 50,181 Reputation points Microsoft Employee Moderator2021-10-06T05:43:24.757+00:00 Hello @Devildoc007 ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
I'm not sure if there is any specific configuration required from Cisco's side as I couldn't find anything related in the Cisco doc:
https://www.cisco.com/c/en/us/td/docs/security/asa/asa98/asav/quick-start-book/asav-98-qsg/asav-azure.htmlBut in Azure, by default, secondary network adapters (also known as network interface cards) are not configured to have a default gateway. Therefore, the traffic flow on the secondary NIC will be limited to the same subnet. If you want to enable secondary NIC to talk outside of it's subnet, you must manually add persistent routes to the operating system and configure the gateway for the secondary network interface.
Please follow the below article to configure the default gateway for your 2nd NIC:
https://learn.microsoft.com/en-us/azure/virtual-machines/linux/multiple-nics#configure-guest-os-for-multiple-nicsKindly let us know if the above helps or you need further assistance on this issue.
Regards,
Gita -
GitaraniSharma-MSFT 50,181 Reputation points Microsoft Employee Moderator
2021-10-07T13:44:48.48+00:00 Hello @Devildoc007 ,
Could you please provide an update on this post?
Kindly let us know if the above helps or you need further assistance on this issue.
Regards,
Gita -
GitaraniSharma-MSFT 50,181 Reputation points Microsoft Employee Moderator
2021-10-11T09:28:41.52+00:00 Hello @Devildoc007 , any updates on this post?
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Devildoc007 1 Reputation point
2021-10-12T14:26:32.263+00:00 Hi @GitaraniSharmaMSFT-4440,
Sorry for the late response. I have been away from my office and have not had a chance to follow up. Thank you for the information you provided. I'll take it from here. Thanks.
JD
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GitaraniSharma-MSFT 50,181 Reputation points Microsoft Employee Moderator
2021-10-12T15:30:49.31+00:00 Thank you for the update @Devildoc007 .
Regards,
Gita
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