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    Home > CrashPlan > Latest > Configuring > Network


    Applies to:
    • CrashPlan for Home
    • CrashPlan PRO
    • CrashPlan PROe


    Use the Network page to control network connection and performance settings.



    Item Description
    a Internal address IP address the computer/device's operating system reports to the CrashPlan application. Read-only.
    b External address

    CrashPlan for Home and CrashPlan PRO​:  Address CrashPlan's cloud sees for this computer. Read-only.

    CrashPlan PROe: Device's IP address from your master server's perspective. Read-only.

    c Discover Click to force CrashPlan to test and update connection status.
    d Network interfaces [Configure...]
    Windows and Mac only

    Backup is disabled when the computer/device is connected via de-selected network interfaces. Unless a network interface is explicitly excluded, backup is allowed over any connected network interface. A network interface must be connected before it can be disabled; however, once an interface is disabled, it remains disabled in CrashPlan unless specifically re-enabled.

    Network Interfaces

    Note: Feature available on Windows and Mac only

    e Wireless networks [Configure...]
    Windows and Mac only

    Backup is disabled when the computer/device is connected via de-selected wireless network SSIDs. Unless a network's SSID is explicitly excluded, backup is allowed over all wireless networks. Click Add to specify an SSID not displayed in the list.

    Wireless Networks

    Click Add to specify additional wi-fi networks. 

    Wireless Networks SSID

    Note: Feature available on Windows and Mac only

    f Proxy enabled Enable proxy settings to connect to the Internet via a proxy server.
    g Proxy PAC URL The URL required to connect to the Internet via a proxy. Contact your network administrator if you do not know the URL for your network.
    h WAN Settings apply when backing up or restoring from a destination across the Internet. If the CrashPlan application sees the destination you are backing up to as a public or routable IP address, WAN settings apply.
    i LAN Settings apply when backing up or restoring from a destination on your local network. If the CrashPlan application sees the destination you are backing up to as a private or non-routable IP address, LAN settings apply.
    j Limit sending rate when away Bandwidth setting when you are not using your computer. Selecting a larger value allows CrashPlan to back up and restore your files faster.
    Linux: Linux does not have an identifier to indicate when a user is away versus present. Consequently, CrashPlan always uses the "away" setting.
    k Limit sending rate when present
    Windows and Mac only
    Bandwidth setting when you are working at your computer. Keep in mind backup and restore will be slower at lower bandwidth settings.
    l Sending1 Expert users only!
    Size of outbound buffer for WAN and LAN (i.e. the amount of data that's allowed to be "in flight" at one time over the network between the source and the destination).
    m Receiving1) Expert users only!
    Size of inbound buffer for WAN and LAN  (i.e. the amount of data that's allowed to be "in flight" at one time over the network between the source and the destination).
    n TCP Packet QoS Advanced users only: must have QoS capable router configured.
    Choose the TCP Packet quality or custom DSCP value from the list: Low, Normal, Reliability, Throughput or DSCP….
    o Undo Changes Reset to previous settings (same effect as cancel).
    p Save Apply changes.

    1) In most circumstances, the expected performance gain from tuning CrashPlan's buffer settings is negligible, and incorrectly configuring these settings can adversely affect network performance.  Some connections, especially over high-latency networks, can benefit from adjustments to buffer sizes, but calculating these values is a topic for experienced network administrators, and beyond the scope of CrashPlan Support.

    Networking FAQs

    Do I need to make firewall changes to use CrashPlan?

    CrashPlan does its best to try and connect to other computers without much configuration on your part, but sometimes you might need to adjust your firewall settings, especially after a CrashPlan upgrade or an operating system update. Connecting to CrashPlan Central and Troubleshooting Connections Between Computers review these settings in detail.

    Do I have to connect to your servers to use CrashPlan?

    If you are a CrashPlan For Home user, yes. The backups go directly to your own computers but they need our service to find each other and establish the connection. This is not user configurable. A connection can persist if one or both computers cannot connect to CrashPlan's servers, but this is not guaranteed. For example, if one computer's IP address changes while its Internet connection is down (and therefore can't connect to CrashPlan), the other computer may not be able to find it.

    If you don't want to rely on our servers for the connection, use CrashPlan For Business.

    What does "Destination unavailable" in the History mean?

    “Destination unavailable. Backup location is not accessible” means that the location of the archive on the destination computer is not valid. This could be because the drive is not currently mounted or because permissions do not allow access.  See Destination Unavailable for more details.

    My firewall is telling me CrashPlan is trying to connect on odd ports. Why is that?

    CrashPlan tries to open random ports for listening as part of the rendezvous connection process. At this time there is no way to stop that. It won't happen if CrashPlan is able to connect to the other CrashPlan computer directly on TCP 4242 (by port forwarding, etc.). We recommend allowing all CrashPlan connections in your firewall.

    How does CrashPlan detect it's on a LAN?

    In lay terms, if the destination computer is across the Internet, it is considered a WAN connection and the WAN bandwidth limits apply.

    The technical definition is this:

    If the computer you're trying to connect to has a routable IP address, then it is considered a WAN connection. If the computer you're connecting to does not have a routable IP address, it is considered a LAN connection and LAN bandwidth throttling settings are applied. Setting the bandwidth to None means no throttling.

    Why does my transfer speed exceed my maximum network speed?

    The speed you see is the “effective speed” and not the raw speed. The effective speed takes into consideration data de-duplication, compression and incremental backup. So if you are sending (or receiving) a lot of duplicate data that compresses really well (e.g. lots of revisions of Word documents where “save as” was used frequently), it's possible to see very high numbers for speed.

    What ports does CrashPlan use?
    • TCP 4242: listening port for computer to computer connections; can be configured under Settings > Backup > Inbound backup from other computers (required for computer to computer backup)
    • TCP 4243: used by the CrashPlan application to connect to the CrashPlan backup service (required)
    • TCP 443: for connecting the CrashPlan backup service to CrashPlan Central (required)
    • TCP > 50000: NAT traversal for connecting between computers (optional)
    • Standard UPnP and NAT-PMP ports: for connecting between computers (optional)
    How does CrashPlan perform on high latency networks like satellite or cellular?

    CrashPlan works extremely well and remains quite usable on high latency networks. There are many reasons for this, but it is mainly because:

    • CrashPlan assumes the worst - It makes no assumptions about quality of link and is quite patient.
    • CrashPlan is extremely efficient - Our binary protocol rides on top of TCP and doesn't waste a bit.
    • CrashPlan is a streaming protocol - It does not rely on acknowledgements (ACK) from the server when sending data. Data is streamed as fast as possible. The only ACK is a TCP ack in the underlying protocol.
    • CrashPlan recovers - Backing up a large file? CrashPlan resumes within the file. So even a 1TB file can be backed up over a poor line that keeps dropping.

    We've been used on cellular networks (1G, 2G, 3G, 4G), satellites, DSL, Cable, Wireless and wired ethernet – all with great success.

    Things you may notice in a high latency situation:

    • Long delay when changing desktop preferences.
    • Frequent restarts of backup due to disconnects.

    It won't give up in these situations, it just keeps trying.

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    Last Modified
    08:53, 15 Aug 2014

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