Parts of the internet keep on disappearing on me

[E.S. Rosenberg]

Could it be that you have a lot of traffic coming out of your station and
you are running out of available tcp/udp ports (in bridged mode the VMs
would not be using ports as their traffic is practically direct with the
NIC, but in NAT mode they would be taking up TCP/UDP ports on your host
machine) ?


2013/1/22 Shachar Shemesh <shachar at shemesh.biz>

>  On 01/22/2013 04:22 PM, Baruch Shpirer wrote:
>
> Are all vms running same os?
>
> My host machine is Debian Squeeze with kernel from backports. My VM is an
> Ubuntu server 12.10 (kernel 3.4, IIRC).
>
> Also, I have some more orderly collected information. All attempts are for
> connecting to my own server (han.lingnu.com):
>
>    - DNS resolution works fine
>    - Ping works fine
>    - Ssh hangs
>    - Sniffing shows that a SYN is sent, a SYN-ACK that seems correct is
>    received, and my computer sends a RST
>     - The same happens to my web connections
>
> Also, when connecting from the VM:
>
>    - When the VM's eth0 is bridged to the host's wlan0, all is working
>    fine.
>    - When the VM's eth0 is connect via NAT, the VM cannot connect either
>    (didn't check with sniffer, but ping works and ssh hangs)
>
> I tried stopping network-manager, switching off the interface (through the
> laptop's switch) and unloading the kernel module for the wifi. I then
> re-enabled everything. The problem remained.
>
> My iptables is devoid of rules.
>
> I could not, this time, check whether cabled connection worked in
> parallel, as the house was asleep. I'll check next time.
>
> Shachar
>
> --
> Shachar Shemesh
>
>
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