s_saluja
Contributor
Contributor

Mutiple Physical NIC on ESXI

Hi, In ESXI I connected 3 network cables with 3 different Physical nic (2 public Network 156.145.14.0/25 156.145.14.128/26 and 1 private 10.116.X.X)  and I created 3 different vswitch one for each network.  Now I created 3 different vm one for each Network. 2 VM with network (10.116.x.x and 156.145.14.128/26) are working fine but VM with 156.145.14.0/25 network has some issue, some time it pings from outside vmware some time not. So it is working but not as per our expectations. Any suggestions ?

 

Thanks

Sumit Saluja

 

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7 Replies
grimsrue
Enthusiast
Enthusiast

Hi s_saluja,

My initial thought is an IP conflict possibly, but without knowing your physical network and interface setup we might have a hard time giving you more specific advice. ESXi Standard switches are very basic. There is not much to configure other than MTU. You might also want to check that MAC learning and Forged Transmits are set to accept.

It will also be a good idea to check hardware like your cables, interfaces or ports. If your switch interfaces and NIC ports are SFPs then it is possible you have bad SFP. If not then it might be a NIC port or switch interface that is the problem and you can move the cable to test. NOTE: If you move the cable to another switch interface you will have to configure that switch interface with the same VLAN and setting as the original.

SSH into the ESXi host and look at the VMNIC stats to see if you are dropping packets, CRC errors, etc.
"esxcli network nic stats get -n vmnicX" replace "X" with vmnic number

Could also be firewall related if the connection is going threw a firewall. You could also have a connection flapping further up stream in your network from your ESXi server. Especially if you have internet facing routers/switches

virtualqc
Enthusiast
Enthusiast

It could be auto negotiation on your nic, may be force the nic speed will help

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harigo_neustar
Contributor
Contributor

You might have resolved this issue by now, but  would like to check still . Usually intermittent connectivity issues may not be config issue. As seen in the other replies, have you looked at your SFP or switch ports . Interested to know what was the issue if you have already resolved it.

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GirgisHady
Contributor
Contributor

please share if you solve this issue or not yet, and if so, what fix it.

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xpmen999
Contributor
Contributor

Your Subnetting for public network

Public A

Address: 156.145.14.0 10011100.10010001.00001110.00 000000
Netmask: 255.255.255.192 = 26 11111111.11111111.11111111.11 000000
Wildcard: 0.0.0.63 00000000.00000000.00000000.00 111111
=>
Network: 156.145.14.0/26 10011100.10010001.00001110.00 000000 (Class B)
Broadcast: 156.145.14.63 10011100.10010001.00001110.00 111111
HostMin: 156.145.14.1 10011100.10010001.00001110.00 000001
HostMax: 156.145.14.62 10011100.10010001.00001110.00 111110
Hosts/Net: 62

Public B
Address: 156.145.14.0 10011100.10010001.00001110.0 0000000
Netmask: 255.255.255.128 = 25 11111111.11111111.11111111.1 0000000
Wildcard: 0.0.0.127 00000000.00000000.00000000.0 1111111
=>
Network: 156.145.14.0/25 10011100.10010001.00001110.0 0000000 (Class B)
Broadcast: 156.145.14.127 10011100.10010001.00001110.0 1111111
HostMin: 156.145.14.1 10011100.10010001.00001110.0 0000001
HostMax: 156.145.14.126 10011100.10010001.00001110.0 1111110
Hosts/Net: 126

same net ?

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frennzyb
Contributor
Contributor

Neither of those are Class Bs.

 

Classful networks don't have masks/prefixes. They can't, by definition.

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xpmen999
Contributor
Contributor

ok, theme cidr.

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