Gateway doesn't establish L3 connection

[Sunsh1ne9874]

Hello,

I can't establish simple L3 virtual GW connection with physical router.

VLAN 555 is trunked between GW and physical router and should work. IP 10.70.70.1 is configured on router vlan 555 interface.

If I do ipconfig on GW, I only see management IP and HNVPA IP, not the 10.70.70.0/24 one you see on the picture, but I guess this info must be stored somewhere else?

Routers aren't pingable between eachorther on subnet 10.70.70.0/24. Maybe config didn't pass through GW correctly? I tried with powershell, same result.

Does HNVPA IPs play any part here? As I understand from SDNExpress scripts, you establish BGP connection with HNVPA IPs, but I can't choose this logical network when creating GW connection.

BTW: Why do I have to specify a gateway IP + peer ip address when creating L3 logical subnet (10.70.70.0/24 in this case) for GW connection, isn't gateway and peer IP the same thing here?

I even have MUX BGP established with physical router with HNVPA addresses, so I think I know what I am doing.

Any ideas?

regards

[AnirbanPaul]

Hi Your setup seems correct. The L3 IP on the gateway VM is on a separate compartment. So, if you run ipconfig /allcompartments /all, you will be able to find it. For the L3 connection, HNVPA network is not used. So, you are right on that. The peer IP address and the gateway IP address for the L3 subnet are usually the same. Internally, we plumb a route in the gateway VM compartment so that any traffic destined to the physical network through the L3 gateway always has the peer IP as the next hop. One thing you should check is if you have plumbed a return route for vnet traffic. So, for any traffic with the destination prefix of the vnet must have the next hop as the L3 gateway IP Address. This link should clarify: RAS Gateway for Software Defined Networking - Azure Local | Microsoft Learn<https://learn.microsoft.com/en-us/azure/azure-local/concepts/gateway-overview#layer-3-forwarding> Thanks Anirban From: Sunsh1ne9874 ***@***.***> Sent: Thursday, December 12, 2024 5:14 AM To: microsoft/SDN ***@***.***> Cc: Subscribed ***@***.***> Subject: [microsoft/SDN] Gateway doesn't establish L3 connection (Issue #621) Hello, I can't establish simple L3 virtual GW connection with physical router. image.png (view on web)<https://github.com/user-attachments/assets/5ee51097-dfe9-4adf-9eb4-1487569f62de> VLAN 555 is trunked between GW and physical router and should work. IP 10.70.70.1 is configured on router vlan 555 interface. If I do ipconfig on GW, I only see management IP and HNVPA IP, not the 10.70.70.0/24 one you see on the picture, but I guess this info must be stored somewhere else? Does HNVPA IPs play any part here? As I understand from SDNExpress scripts, you establish BGP connection with HNVPA IPs, but I can't choose this logical network when creating GW connection. BTW: Why do I have to specify a gateway IP + peer ip address when creating L3 logical subnet (10.70.70.0/24 in this case) for GW connection, isn't gateway and peer IP the same thing here? I even have MUX BGP established with router with HNVPA addresses, so I think I know what I am doing. Any ideas? regards - Reply to this email directly, view it on GitHub<#621> or unsubscribe<https://github.com/notifications/unsubscribe-auth/AEBB63JVX7ANOJ7P5X4AJBL2FGDY5BFKMF2HI4TJMJ2XIZLTSOBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJLJONZXKZNENZQW2ZNLORUHEZLBMRPXI6LQMWBKK5TBNR2WLJDUOJ2WLJDOMFWWLLTXMF2GG2C7MFRXI2LWNF2HTLDTOVRGUZLDORPXI6LQMWSUS43TOVS2M5DPOBUWG44SQKSHI6LQMWVHEZLQN5ZWS5DPOJ42K5TBNR2WLKBUGYZTGNBZGQZYFJDUPFYGLJLJONZXKZNFOZQWY5LFVIZDOMZVHA3DSMZWGSTXI4TJM5TWK4VGMNZGKYLUMU>. You are receiving this email because you are subscribed to this thread. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[Sunsh1ne9874]

Hello,

thank you for the reply!

I have routes in place on the physical router but still no success.

When I run ipconfig /allcompartments /all on the GW, it only shows compartment 1 and not the one with L3 subnet.

Any more ideas please? :)

Regards

[AnirbanPaul]

Can you send email to ***@***.******@***.***>. We can continue there. Thanks Anirban From: Sunsh1ne9874 ***@***.***> Sent: Monday, December 16, 2024 2:31 AM To: microsoft/SDN ***@***.***> Cc: Comment ***@***.***>; Subscribed ***@***.***> Subject: Re: [microsoft/SDN] Gateway doesn't establish L3 connection (Issue #621) Hello, thank you for the reply! I have routes in place on the physical router but still no success. When I run ipconfig /allcompartments /all on the GW, it only shows compartment 1 and not the one with L3 subnet. Any more ideas please? :) Regards - Reply to this email directly, view it on GitHub<#621 (comment)> or unsubscribe<https://github.com/notifications/unsubscribe-auth/AEBB63KDMEHSDMC5L6TWB2L2F2TW3BFKMF2HI4TJMJ2XIZLTSOBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJDUOJ2WLJDOMFWWLLTXMF2GG2C7MFRXI2LWNF2HTAVFOZQWY5LFUVUXG43VMWSG4YLNMWVXI2DSMVQWIX3UPFYGLLDTOVRGUZLDORPXI6LQMWWES43TOVSUG33NNVSW45FGORXXA2LDOOJIFJDUPFYGLKTSMVYG643JORXXE6NFOZQWY5LFVA2DMMZTGQ4TIM4CUR2HS4DFUVUXG43VMWSXMYLMOVS2UMRXGM2TQNRZGM3DJJ3UOJUWOZ3FOKTGG4TFMF2GK>. You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.