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Forum Discussion
Just HOW slow is EnableRsyncSSH on a (SPARC) Duo?
I want to be able to sync two Duos at two different sites connected by ADSL broadband lines.
The sites are on different telephone exchanges, which have different ADSL capabilities ... the speed in each direction will be limited by the upload speed of the sending site, 400kB/s in once case, 800kB/s in the other (download about 20x faster in each case).
One option for me would be to open a port in the firewall at each end and use the EnableRsyncSSH add-on on each Duo to let them manage their own security. I do understand that a SPARC-on-a-chip NAS isn't going to have enough compute power to run SSL at a very high speed ... but would it be able to keep up with an 800k connection? It doesn't need to do any more.
Other options include setting up a VPN between the routers at the two sites. Both routers support VPN endpoints but as they're different makes (one Netgear and one Draytek) I forsee an uphill struggle to get that working -- and I don't suppose the chips in the routers are much faster than that in the NAS?
Can I rely on the Rsync/SSH software being secure? Debian (on which I think the Duo OS is based) has had quite a few security fixes in SSL software over the years ... have these made it into the NAS software? Is it really suitable for exposure to the public internet?
Thanks.
The sites are on different telephone exchanges, which have different ADSL capabilities ... the speed in each direction will be limited by the upload speed of the sending site, 400kB/s in once case, 800kB/s in the other (download about 20x faster in each case).
One option for me would be to open a port in the firewall at each end and use the EnableRsyncSSH add-on on each Duo to let them manage their own security. I do understand that a SPARC-on-a-chip NAS isn't going to have enough compute power to run SSL at a very high speed ... but would it be able to keep up with an 800k connection? It doesn't need to do any more.
Other options include setting up a VPN between the routers at the two sites. Both routers support VPN endpoints but as they're different makes (one Netgear and one Draytek) I forsee an uphill struggle to get that working -- and I don't suppose the chips in the routers are much faster than that in the NAS?
Can I rely on the Rsync/SSH software being secure? Debian (on which I think the Duo OS is based) has had quite a few security fixes in SSL software over the years ... have these made it into the NAS software? Is it really suitable for exposure to the public internet?
Thanks.
3 Replies
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- 800kB/s seems quite high for ADSL upspeed. Did you mean 800 kb/s???
StephenB wrote: 800kB/s seems quite high for ADSL upspeed. Did you mean 800 kb/s???
Er, yes. Sorry ... don't know what I was thinking!
:oops:
The point is, though, that as the rsync would be taking place between two ADSL-connected Duos the network speed would be really realy really slow anyway, and I'm hoping that Duo would be fast enough to handle rsync over SSL at those speeds. Can anyone tell me whether that's a realistic hope?
Thanks.- For a while I had the Duo connect to my Linux Laptop via RSync over SSH in my LAN.
The transfer rate was around 1,3MB/s while SAMBA transfer (limited by the WLAN) was around 3MB/s, so you should easily saturate your upload.
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