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admin-debug [2023/09/09 00:36] – -clarity on Chevron points hogwildadmin-debug [2025/12/05 17:36] (current) – -Add explanation for kernel printk log level hogwild
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 ===== Debugging ===== ===== Debugging =====
  
-The Debugging page helps you tweak some parameters to allow better troubleshooting of any issues with your router.+The Debugging page lets you tweak some parameters to allow better troubleshooting of router issues.
  
-\\ {{:pasted:20220107-075831.png}}\\  \\+ \\ \\ {{:pasted:20220107-075831.png}}\\  \\
  
-**Avoid performing an NVRAM commit** - Checking this stops configuration settings from being permanently saved to NVRAM until this setting is disabled again. This makes it easy to safely experiment with settings, since changes reset at reboot.+ \\
  
-**Enable cprintf output to console** - Enabling this sets cprintf to output to the console so it will be visible within your web browser.+**Avoid performing an NVRAM commit** - stops configuration settings from permanently saving to NVRAM until this is disabled again.
  
-**Enable cprintf output to /tmp/cprintf **- Enabling this redirects cprintf output to a file in the /tmp/cprintf directory.+This makes it easy/safe to experiment with settings, since changes reset on reboot.
  
-**Enable DDNS output to /tmp/mdu - **This option allows the DDNS diagnostics to be fully logged in the "/tmp/" directory.+ \\
  
-**Enable segfault logging - **By default, segfault errors are not logged via the syslog functiony. Enabling this option causes them to be logged. Segfaults are Linux errors caused by a program trying to read from or write to an illegal memory location.+**Enable cprintf output to console** - sets cprintf to output to the console so it will be visible in your web browser.
  
-**Count cache memory and buffers as free memory** - This affects how Linux handles RAM allocation, which is split into Used + cache + buffer. If enabled, this causes cache memory and buffer to be counted as free. (Default: enabled).+ \\
  
-**Avoid displaying LAN to router connections -** Enabling this prevents LAN connections from being displayed in menus that show //conntrack//-related data, such as the //QoS///[[qos-detailed|View Details]] menu.\\   \\   \\  {{:pasted:20220107-082615.png}} \\+**Enable cprintf output to /tmp/cprintf **- redirects cprintf output to a file in the /tmp/cprintf directory.
  
-\\ **Kernel printk log level**:FIXME + \\
- +
-**Do not restart the following process if they die **-  Usually FreshTomato restarts dying processes. However, in some cases, you may want to prevent this from happening.+
  
-  * crond - This option prevents FreshTomato from restarting the cron daemon, if it dies. +**Enable DDNS output to /tmp/mdu - **allows the DDNS diagnostics to be fully logged in the "/tmp/" directory.
-  * dnsmasq - This option prevents FreshTomato from restarting dnsmasq, if it dies. \\ **This option is currently non-functional**. +
-  * hotplug2 - This option prevents FreshTomato from restarting the hotplug2 daemon, if it dies. +
-  * igmprt - This options prevents FreshTomato from restarting the IGMP routing daemon, if it dies. \\ \\ Igmprt is a simple dynamic Multicast Routing Daemon that uses only IGMP protocol for signalling. \\ It's used for simple forwarding of Multicast traffic between networks.+
  
  \\  \\
  
-**Set "no-cache" in httpd header - **A very common issue is that is cached browser content can create errors/display issues in the web interface. Usually, refreshing the page, via CTRL+F5, fixes this problem by forcing a cache flush. However, setting this parameter is an alternative solution. This instructs the browser not to perform any caching while on FreshTomato web interface pages. Both methods are particularly useful after firmware upgrades.+**Enable segfault logging - **causes segfault errors to be logged. 
 + 
 +By default, syslog doesn't log segfault errors. Segfaults are Linux errors caused by a program trying to read from/write to an illegal memory location.
  
  \\  \\
 +
 +**Count cache memory and buffers as free memory** - affects how Linux handles RAM allocation, (split into Used + cache + buffer).
 +
 +If enabled, this causes cache memory and buffer to be counted as free. (Default: enabled).
  
  \\  \\
  
-» Clear browser cookies - Clicking this clears the cookies in your web browser.+**Avoid displaying LAN to router connections -** prevents LAN connections from displaying in menus with //conntrack//-related data. 
 + 
 +This includes the ///QoS///[[qos-detailed|View Details]] menu.\\   \\   \\ {{:pasted:20220107-082615.png}} \\ 
 + 
 +\\  \\ 
 + 
 +**Kernel printk log level**: controls the detail level of kernel messages printed to the console and log buffer via the printk() function 
 + 
 +Kernel messages use numeric levels. Lower numbers indicate higher priority: 0 (KERN_EMERG) for system crashes, 3 (KERN_ERR) for errors, 6 (KERN_INFO) for general info, and 7 (KERN_DEBUG) for detailed debugging. Setting a higher value or 7 or 8 in "/proc/sys/kernel/printk" allows more messages, including debug output, to print immediately to the console rather than just the ring buffer viewable via dmesg.\\ 
 + 
 +**Do not restart the following process if they die **-  Usually FreshTomato restarts dying processes. However, in some cases, you may want to prevent this from happening.
  
  \\  \\
  
-» Clear browser cache - Clicking this clears your web browser's cache of static content. This includes things like static graphics, CSS, HTML and Javascript. This is helpful when incorrect or garbled content is being displayed in the FreshTomato web interface because the browser is displaying stale, cached content instead of current content.+  * crond - prevents FreshTomato from restarting the cron daemon, if it dies. 
 +  * dnsmasq - prevents FreshTomato from restarting dnsmasq, if it dies. \\ **This option is currently non-functional**. 
 +  * hotplug2 - prevents FreshTomato from restarting the hotplug2 daemon, if it dies. 
 +  * igmprt - prevents FreshTomato from restarting the IGMP routing daemon, if it dies. \\ Igmprt is a simple dynamic Multicast Routing Daemon using only IGMP \\ for signaling. It performs simple Multicast traffic forwarding between networks.
  
  \\  \\
  
-» Flush DNS (dnsmasq) cache - Clicking this flushes the router's DNS cache. This purges DNS to IP mappings/lookups, so fresh ones are used instead. This is useful when changing DNS server or other settings affecting DNS mappings, so the system uses only current DNS mappings.+**Set "no-cache" in httpd header - **cached browser content can often create errors/issues in the web interface. Usually, refreshing the webpage fixes the problem by flushing the cache. However, setting this parameter is an alternative solution. It tells the browser not to perform any caching while on FreshTomato web interface pages. Both methods are useful after firmware upgrades.
  
  \\  \\
  
-» Commit NVRAM now - Clicking this saves current settings to NVRAM immediately.+ \\ 
 + 
 +»  Clear browser cookies - clears the cookies in your web browser. 
 + 
 + \\ »  Clear browser cache - clears the browser cache of static content. This includes static graphics, CSS, HTML and Javascript. \\ This helps prevent incorrect/garbled content from displaying in the web interface when the browser displays stale, cached, outdated content. 
 + 
 + \\ »  Flush DNS (dnsmasq) cache - Clicking this flushes the router's DNS cache. This purges DNS to IP mappings, so only fresh ones are used. This is useful when changing DNS server or other settings affecting DNS mappings, so the system uses only current DNS mappings.
  
  \\  \\
  
-» Reboot - Clicking this reboots the system immediately (similar to the "Reboot..." menu).+»  Commit NVRAM now - saves current settings to NVRAM immediately.
  
  \\  \\
  
-» Halt - Clicking this halts the system immediately, (similar to the "Halt..." menu option).+»  Reboot - reboots the system immediately (similar to the "Reboot..." menu).
  
  \\  \\
  
-» Download CFE - Clicking this lets you download the Common Firmware Environment file from your router.  [[https://en.wikipedia.org/wiki/Common_Firmware_Environment|Common Firmware Environment]]\\+»  Halt - halts the system immediately, (similar to the "Halt..." menu option).
  
-   Warning: The NVRAM Dump text file may contain information like WiFi encryption keys and usernames/passwords for FreshTomato, your ISP and DDNS. \\ Please   review & edit this file before sharing it with anyone. \\+ \\
  
-» Download Iptables Dump - Clicking this downloads a copy of the IPv4 iptables firewall rule file.+»  Download CFE - downloads the [[https://en.wikipedia.org/wiki/Common_Firmware_Environment|Common Firmware Environment]] file from your router. 
 + 
 + \\ \\ »  Download Iptables Dump - downloads a copy of the IPv4 iptables firewall rule file.
  
  \\  \\
  
-» Download Ip6tables Dump - Clicking this downloads of the IPv6 iptables firewall rule file.+»  Download Ip6tables Dump - downloads of the IPv6 iptables firewall rule file. 
 + 
 +\\ 
 + 
 +»  Download Logs - downloads a copy of the syslog file.
  
  \\  \\
  
-» Download Logs - Clicking this downloads a copy of the syslog file.+» Download NVRAM Dump - downloads a copy of NVRAM memory contents.
  
  \\  \\
  
-» Download NVRAM Dump - Clicking this downloads a copy of the contents of NVRAM memory.+**Warning**: This file may contain private information like WiFi encryption keys, and usernames/passwords for FreshTomato, your ISP and DDNS. Please review and edit/redact it appropriately before sharing it with anyone.
  
-\\+ \\ 
 + 
 + \\ \\
  
  
admin-debug.1694216194.txt.gz · Last modified: by hogwild

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