Forum Discussion
GregorySuvalian
Jan 23, 2018Iron Contributor
VMs on the same VNET can not talk to each other
Not sure what is exactly happening since it was always working before but VMs on different subnets within the same virtual network with no NSGs or firewalls between them can not talk to each other. P...
- Jan 25, 2018
In that case i suggest you file a ticket so the network can be checked in the back end.
GregorySuvalian
Iron Contributor
=========================================================================== Interface List 14...00 0d 3a 02 8d 68 ......Microsoft Hyper-V Network Adapter #2 1...........................Software Loopback Interface 1 15...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.0.0.1 10.0.0.4 261 10.0.0.0 255.0.0.0 On-link 10.0.0.4 261 10.0.0.4 255.255.255.255 On-link 10.0.0.4 261 10.255.255.255 255.255.255.255 On-link 10.0.0.4 261 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 10.0.0.4 261 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 10.0.0.4 261 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 10.0.0.1 Default =========================================================================== IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 14 261 fe80::/64 On-link 14 261 fe80::8d2a:8b0e:c4ad:807b/128 On-link 1 306 ff00::/8 On-link 14 261 ff00::/8 On-link =========================================================================== Persistent Routes: None
Windows IP Configuration Host Name . . . . . . . . . . . . : core-dc01 Primary Dns Suffix . . . . . . . : ecomply.local Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : ecomply.local Ethernet adapter Ethernet 2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter #2 Physical Address. . . . . . . . . : 00-0D-3A-02-8D-68 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::8d2a:8b0e:c4ad:807b%14(Preferred) IPv4 Address. . . . . . . . . . . : 10.0.0.4(Preferred) Subnet Mask . . . . . . . . . . . : 255.0.0.0 Default Gateway . . . . . . . . . : 10.0.0.1 DHCPv6 IAID . . . . . . . . . . . : 335547706 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-21-F4-ED-77-00-15-5D-0A-1D-DE DNS Servers . . . . . . . . . . . : ::1 10.0.0.4 10.0.0.5 NetBIOS over Tcpip. . . . . . . . : Enabled Tunnel adapter isatap.{4EA8D25B-523C-4E10-B0A9-3A7FE5508DC1}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2 Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes
Hannel Hazeley
Jan 24, 2018Iron Contributor
2 things that stands out in OS configuration.
1. The persistent route should be needed
2. Static IP for Azure VM should be setup from the portal and not in the guest OS
Also did the issue start after a change to the environment? (joined domain, etc...)
Since the issue is at the subnet level confirm no subnet NSG or User Define routes on subnet.
- GregorySuvalianJan 25, 2018Iron ContributorNeither persistent route no static IP is required to route between subnets. They shall work per documentation out of the box with no additional changes.
There is no NSGs setup on any level, there is no firewalls on either side.
I'm pretty sure something is broken in Azure specifically for my VNET setup and not something specific to VMs which I put in.- Hannel HazeleyJan 25, 2018Iron Contributor
In that case i suggest you file a ticket so the network can be checked in the back end.
- Patrick FontanaApr 16, 2019Copper ContributorThe answer in this area is quet easy. Since the last Azure Network changes and the introduction of "Vnet Peering" each subnet og a VNET has his own NSG and route table assignement. so in this case when you work only in one VNET you Have to create a custom route table an have to set the "virtual Network Gateway route Propagation" to "enabled". So all subnets have a container to publish there gateway and next-Hop configuration. configure each subnet with the same route table and Problem is solved