On Fri, Oct 21, 2016 at 10:19 PM, Nick Fisk <n...@fisk.me.uk> wrote:

> Hi,
>
> I'm just testing out using a Ceph client in a DMZ behind a FW from the
> main Ceph cluster. One thing I have noticed is that if the
> state table on the FW is emptied maybe by restarting it or just clearing
> the state table...etc. Then the Ceph client will hang for a
> long time as the TCP session can no longer pass through the FW and just
> gets blocked instead.
>

This "FW" is linux firewall or hardware FW?


>
> I believe this behaviour can be adjusted by the "ms tcp read timeout"
> setting to limit its impact, but wondering if anybody has any
> other ideas. I'm also thinking of experimenting with either stateless FW
> rules for Ceph or getting the FW to send back RST packets
> instead of silently dropping packets.
>

hmm, I think it depends on FW


>
> Thanks,
> Nick
>
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