ZyXEL Communications USG FLEX H Series - Page 433

Chapter 29 Troubleshooting
USG FLEX H Series User’s Guide
433
My packet capture captured less than I wanted or failed.
The packet capture screen’s File Size sets a maximum size limit for the total combined size of all the
capture files on the Zyxel Device, including any existing capture files and any new capture files you
generate. If you have existing capture files you may need to set this size larger or delete existing capture
files.
The Zyxel Device stops the capture and generates the capture file when either the capture files reach
the File Size or the time period specified in the Duration field expires.
My earlier packet capture files are missing.
New capture files overwrite existing files of the same name. Change the File Suffix field’s setting to avoid
this.
My Zyxel Device CPU usage is too high. I see an alert log that says “abnormal TCP flag attack
detected”.
Your FTP server is in active mode. It is sending too much traffic to the Zyxel Device. Set your FTP server to
passive mode.
I cannot apply a configuration file.
The configuration file you upload to the Zyxel Device must meet the following requirements:
• The configuration file size cannot be 0.
• The configuration file is a text file.
• The model name in the configuration file must be the same as the Zyxel Device model you’re
uploading to.
My Zyxel Device cannot assign correct IP addresses to DHCP clients in my LAN and DMZ.
Make sure your Zyxel Device is the only device with DHCP server enabled in your network.
The clients’ information I collected using device insight is not correct.