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I have a vanilla install of Ubuntu Server 12.10 running on an old P4 PC with 512MB RAM and a 10/100 NIC. Default samba config, with a simple share defined as follows:

[public]
comment = Ubuntu File Server Share
path = /srv/samba/share
browsable = yes
guest ok = yes
read only = no
create mask = 0755

As stated in the title, here are the symptoms of this strange problem:

  • When I copy files TO (important) the server from windows hosts that are connected to the network via Gigabit Ethernet (important), the server appears to be no longer available to OTHER machines on the network.
  • For the duration of the file copy operation, other hosts cannot ping the server, SSH to the server or see the server on the network in any way.
  • Once the file copy operation is complete, the server is again available on the network and all other clients can connect to it
  • The file copy always succeeds, no timeout issues or file corruption
  • The host that is copying the file is still able to make other connections to the same server (ICMP, SSH, etc)
  • The file copy runs at pretty much max throughput for the 10/100 NIC
  • All non wireless clients are connected via a gigabit Ethernet switch
  • There are no suspected hardware issues with the PC at this time

Note

  • Copying large files FROM the server to the windows hosts (gigabit or otherwise) does not exhibit any of the above symptoms
  • Copying large files TO the server from 802.11N wireless clients or 10/100 clients does not exhibit any of the above symptoms

Troubleshooting Steps so far (always same symptoms as above)

  • Tried a different 10/100 NIC in the server (completely different brand)
  • Installed Ubuntu 10.04.4 LTS (Lucid Lynx)
  • Moved NIC to different PCI slots
  • Tried a different brand of gigabit Ethernet switch
  • Tried different network cables

I know this a pretty specific and isolated problem, but I thought I'd ask in case someone has seen this before.

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