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advanced-misc [2026/07/23 18:23] – -Condense, clarify and reformat CTF section hogwildadvanced-misc [2026/07/23 18:35] (current) – -Clarity, condense, formatting hogwild
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  \\ {{:pasted:20220428-100159.png?145}} \\   \\   \\ **CTF (Cut-Through Forwarding): ** if checked, enables Level 1 NAT hardware acceleration.  \\ {{:pasted:20220428-100159.png?145}} \\   \\   \\ **CTF (Cut-Through Forwarding): ** if checked, enables Level 1 NAT hardware acceleration.
  
-CTF lets bridges use an alternative forwarding method for storing/forwarding frames. Enabling it may improve speeds on Internet plans with a profile above 100 Mb/second. CTF is usually necessary to reach peak speeds on plans that allow 200 Mb/second and higher.+CTF lets bridges use an alternative forwarding method for storing/forwarding frames. Enabling it may improve speeds on Internet plans with a profile above 100 Mb/second. It is usually necessary to reach peak speeds on plans of 200 Mb/second and higher.
  
-With CTF enabled, the router sends transmission frames as soon as it receives the full packet header. However, it relies on the client to tell it whether the data is corrupted for resend. This restriction can cause problems with a few common home uses. For example: //**Enabling CTF disables QoS / Bandwidth Limiter**//.+With CTF enabled, the router sends transmission frames as soon as it receives the full packet header. However, it relies on the client to tell it whether the data is corrupted for resend. This restriction can cause problems with a few common home uses.
  
-CTF can also cause issues with IPv6 tunneling protocols,** **like 6in4 Static.+ \\ 
 + 
 +For example: //**Enabling CTF disables QoS / Bandwidth Limiter**//.
  
-This is because the switching part of the packet bypasses parts of the standard Linux iptables chains.+CTF can also cause issues with IPv6 tunneling protocols,** **like 6in4 Static, because the switching part of the packet bypasses parts of the standard Linux iptables chains.
  
 With CTF disabled, the router stores the entire frame before sending it to its destination. With CTF disabled, the router stores the entire frame before sending it to its destination.
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   * MIPS RT-N routers (like the E4200v1, RT-N16) can use Broadcom FastNAT   * MIPS RT-N routers (like the E4200v1, RT-N16) can use Broadcom FastNAT
   * MIPS RT-AC routers (like the RT-AC66U) do not support CTF or FastNAT.   * MIPS RT-AC routers (like the RT-AC66U) do not support CTF or FastNAT.
 +
 + \\
  
 On ARM devices, you can expect performance in the range of 200 to 400 Mb/s with CTF enabled. On ARM devices, you can expect performance in the range of 200 to 400 Mb/s with CTF enabled.
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 **Enable Jumbo Frames:** lets you increase the maximum frame size on the LAN. (Default: disabled). **Enable Jumbo Frames:** lets you increase the maximum frame size on the LAN. (Default: disabled).
  
-The default Jumbo Frames size is 2 KBytes. If enabled, Jumbo Frame capability will be enabled on all LAN/WAN ports.+The default Jumbo Frames size is 2 KB. If enabled, Jumbo Frame capability will be enabled on all LAN/WAN ports. This feature is supported only in 1000 Mb/s mode. 
 + 
 +Gigabit switches use more memory with this feature enabled. This can affect performance, depending on how many switch ports simultaneously use jumbo frames.
  
-This feature is supported only in 1000 Mb/s mode. Also, gigabit switches use more memory with this feature enabled. This can affect performance, depending on how many switch ports simultaneously use jumbo frames. Not all hardware models support this feature.+Not all models support this feature.
  
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 If disabled, default frame size is 2 KB. (Default: off). Generally, enable Jumbo Frames if you frequently transfer large files within your LAN. To function, all devices must support Jumbo Frames. You should also standardize the packet size across all LAN devices. If disabled, default frame size is 2 KB. (Default: off). Generally, enable Jumbo Frames if you frequently transfer large files within your LAN. To function, all devices must support Jumbo Frames. You should also standardize the packet size across all LAN devices.
  
-It's best to leave this disabled unless you have specific requirements for it. Using Jumbo Frames means Internet traffic will be fragmented, unless the end device supports Path MTU Discovery. Often, the limited performance benefits of Jumbo Frames isn't worth the time and effort needed to tune/troubleshoot it.+Leave this disabled unless you have specific requirements for it. Unless the end device supports Path MTU Discovery, using Jumbo Frames means Internet traffic will be fragmented. Often, the limited performance benefits of Jumbo Frames isn't worth the time and effort needed to tune/troubleshoot it.
  
-Not all hardware models support this feature.+Not all models support this feature.
  
 ** **\\ ** **\\
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 **Port Health:** Since r2025.5, this watchdog counts errors on Ethernet connections and takes a defined action when an exception is spotted. **Port Health:** Since r2025.5, this watchdog counts errors on Ethernet connections and takes a defined action when an exception is spotted.
  
-This function was introduced to prevent a bad  Ethernet cable to take your router down (eating up CPU cycles) and  making the device unresponsive.+This function was introduced to prevent a bad Ethernet cable to take your router down (eating up CPU cycles) and making it unresponsive.
  
  \\ \\ {{port_health.png?591}}  \\ \\ {{port_health.png?591}}
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 **Enable:** runs the porthealth process to monitor the defined ports scope, every minute. **Enable:** runs the porthealth process to monitor the defined ports scope, every minute.
  
-The check is extremely lightweight and executes in about 0.02 - 0.04 seconds.+The check is lightweight and executes in about 0.02 - 0.04 seconds.
  
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-**Max Errors / Minute **AKA: "threshold". The number of acceptable errors per minute before an action (defined under Mode) is triggered.+**Max Errors / Minute **AKA: "threshold". How many acceptable errors per minute before an action (set under Mode) is triggered.
  
-Under most circumstances, you'd expect the number of errors to be "0". However, in certain cases, it can be advisable to add a little tolerance to deal with temporary situations like interference, temperature, etcetera.+Usually, you'd expect the number of errors to be "0". However, in certain cases, it can be wise to add some tolerance to deal with temporary situations like interference, temperature, etcetera.
  
  \\  \\
  
-**Hold Time: **acts as "cooldown" and "efficiency" filter to prevent the script from making erratic or unnecessary changes to network ports.+**Hold Time: **acts as "cooldown" / "efficiency" filter to prevent the script from making erratic or unnecessary changes to network ports.
  
-In this context, it is ideal for the router to have a "calm” decision-making process. When a port shows errors, the script steps down the link speed (say, from 1000FD to 100FD). The Hold Time ensures the system stays at the new speed long enough to see if the errors stop. If the script runs again before the 180 second (default) has passed, it will skip further down-stepping for that specific port, giving the hardware time to stabilize.+In this context, the router should ideally have a "calm” decision-making process. When a port shows errors, the script steps down the link speed (say, from 1000FD to 100FD). The Hold Time ensures the system stays at the new speed long enough to check if the errors stop. If the script runs again before the 180 second default has passed, it will skip further down-stepping for that specific port, giving giving the hardware time to stabilize.
  
  \\  \\
  
-**Cache TTL** - defines how often the script performs the "heavy lifting" of scanning router hardware to know which ports are active.+**Cache TTL** - how often the script performs the "heavy lifting" of scanning router hardware to learn which ports are active.
  
-Identifying which ports are active involves more than just scanning them individually for errors. The script saves the list of active ports to a file in: "/tmp".  By default, it will reuse that list (only) for 1800 seconds (30 minutes). It only rescans the hardware if the cache file is older than the TTL or if  the file is missing. This parameter doesn't affect the ultra-light scan for errors on active ports, happening every minute.+Identifying which ports are active involves more than just scanning them individually for errors. The script saves the list of active ports to a file in: "/tmp".  By default, it will reuse that list (only) for 1800 seconds (30 minutes). It only rescans the hardware if the cache file is older than the TTL or the file is missing. This parameter doesn't affect the ultra-light scan for errors on active ports, (occurring every minute).
  
  
advanced-misc.txt · Last modified: by hogwild

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