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CrashPlan appears to upload stuff on the standard HTTPS port 443.

Is there any way to allocate it bulk QoS priority separately from all other HTTPS traffic, or am I completely stuffed?

I'm using DD-WRT.

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4 Answers

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There's a setting for CrashPlan to tag its packets itself: TCP packet TOS

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Do any of the popular router firmwares look at this field? Mine (DD-WRT) doesn't have any options to use this. – romkyns Apr 12 '11 at 9:28
I bet DD-WRT will do what you want, but I haven't used it so I'm not sure. If you don't mind switching firmwares, try Tomato, I bet you'll like it. It makes doing what you want easy. – Jon-Eric Apr 12 '11 at 16:22
DD-WRT doesn't have any options in the GUI for this, but apparently it's hackable via SSH... Tomato isn't supported on my router :( – romkyns Apr 12 '11 at 18:54
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up vote 2 down vote

There is a tip on the DD-WRT forum.

Use this in your firewall script, the mark values are explained on the QoS wiki page. 

iptables -t mangle -I POSTROUTING -d [destination ip] -j MARK --set-mark 40 
iptables -t mangle -I PREROUTING -s [source ip] -j MARK --set-mark 40

Since they're both using iptables, you can do the same as Tomato. You just don't have a nice GUI.

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up vote 1 down vote

Use CrashPlan's settings to rate-limit its traffic. Considering that HTTPS traffic is encrypted end-to-end (well, it's supposed to be), your router's not going to be able to determine what traffic belongs to it. The only end-run around that is if you could do QoS based on destination IP address. I don't know enough about DD-WRT to tell you whether or not that's possible.

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As I'm sure you realise, I have to rate-limit it to the lowest acceptable setting, wasting all the bandwidth at those times when nothing else is using it. Which is exactly why I want QoS instead. – romkyns Feb 21 '11 at 22:48
I know what you're looking for, and understand the frustration. Unfortunately, I don't think there's anything to be done about it. – afrazier Feb 21 '11 at 22:58
Ah I see. We'll see what CrashPlan support have to say about this; perhaps there's a hidden "change ports" option somewhere... – romkyns Feb 22 '11 at 2:21
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up vote 0 down vote

I use Tomato, not DD-WRT, but I found it very easy to setup QoS for crashplan.

I configured QoS based upon destination IPs for central.crashplan.com on port 443 and classified it as bulk traffic.

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