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Old 09-11-2016, 08:55 PM   #1
vladguan
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Putty to Centos 7 issue


Hi All,

Another day, another question. I have a CentOS 7 VMware VM running in a CentOS 7 physical machine. From the host machine, I can SSH to the VM without issues. However, from my Windows 7 PC, after a reboot, I cannot Putty to it unless I ping it first. The first ping response is also lost. I have no issues Puttying into any other CentOS 6.5/7, be it physical or VM.

The Ethernet virtual device is e1000.

Anyone have ideas why this is happening? I read up on Arp table issues but why is it only happening to this one system?

TIA,
Vlad
 
Old 09-13-2016, 10:13 AM   #2
pan64
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insufficient information.
after reboot of what?
how did you configure your network? Firewall/router/proxy/VM/whatever...
probably I would try to check network traffic (wireshark?)
 
Old 09-13-2016, 10:29 PM   #3
vladguan
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Quote:
Originally Posted by pan64 View Post
insufficient information.
after reboot of what?
how did you configure your network? Firewall/router/proxy/VM/whatever...
probably I would try to check network traffic (wireshark?)

Each time I reboot my Windows 7 PC. I use the Windows 7 PC to SSH/Remote to various servers to administer them. Every other Centos/Ubuntu/Fedora physical or virtual machine have no issues. It is just this particular one that each time my Windows 7 PC reboots, I cannot putty SSH to the said CentOS 7 VM without doing a successful ping first and the first ping response is always a failure with a Request timed out message.

It is not to do with it being missing from ARP table as ping results are all successful after removing it from ARP table.

There are other CentOS 7 VMware VMs as well as Windows 7 VMware VMs running on the CentOS host and I have no issues with them. All the VMs are set up the same way. As for network, it is an internal network with no router and firewall so to speak.
 
Old 09-14-2016, 10:40 PM   #4
vladguan
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I think I have found out what the issue is. The prefix for the Ethernet was accidentally set to 32 instead of 24.
 
  


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