Chapter 6 Maintenance
ZyWALL USG100-PLUS User’s Guide
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1 Insert a USB storage device to any USB port on your ZyWALL. In the Monitor > System Status >
USB Storage screen, make sure the USB device’s file system doesn’t display “unknown”.
2 Go to Configuration > System > USB Storage, select Activate USB storage service and click
Apply.
3 In the Maintenance > Diagnostics > Core Dump > Collect screen, select Save core dump to
USB storage. Click Apply.
6.11 How to Use Packet Flow Explore for Troubleshooting
Use the packet flow explore function to help resolve routing or NAT problems. For example: an
interface suddenly goes down, you configure a policy route but packets do not go through the
configured interface or go through another route.
The Maintenance > Packet Flow Explore > Routing Status screen displays the ZyWALL’s
current routing flow. Click a function box to get the corresponding active routes. The ZyWALL routes
packets in the order of the flow as shown from left to right. Once a packet matches the criteria of a
route, the ZyWALL routes the packet and does not perform any further routing checking.
The Maintenance > Packet Flow Explore > SNAT Status screen displays the ZyWALL’s current
source NAT (SNAT) flow. Click a function box to see the corresponding active SNAT rules. The
ZyWALL checks if a packet matches an SNAT rule’s criteria by following the order of the flow as
shown from left to right. Once a packet matches the criteria of an SNAT rule, the ZyWALL takes the
corresponding action on the packet and does not perform any further SNAT flow checking.
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