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advanced-dhcpdns [2022/04/20 18:27] – rs232advanced-dhcpdns [2023/04/25 14:28] – rs232
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-====== DHCP/DNS ======+====== DHCP/DNS/TFTP ======
  
 The Advanced / DHCP/DNS page allows you to configure advanced settings for the DHCP and DNS services for both LAN and WAN. Most of this functionality is provided by [[https://thekelleys.org.uk/|dnsmasq]]. The Advanced / DHCP/DNS page allows you to configure advanced settings for the DHCP and DNS services for both LAN and WAN. Most of this functionality is provided by [[https://thekelleys.org.uk/|dnsmasq]].
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 **DHCPC Options:**  In this field you can enter custom configuration settings for the dhcp client. **DHCPC Options:**  In this field you can enter custom configuration settings for the dhcp client.
  
-**Reduce Packet Size:** //udhcpc// (the DHCP client FreshTomato uses to obtain a WAN IP address) has a problem. It has a DHCP discovery packet size 590 bytes long. However, DHCP relay servers can only handle DHCP discovery packets up to 576 bytes. If there are DHCP relay servers between your FreshTomato router and your Internet provider's DHCP server, FreshTomato might fail to acquire a DHCP lease on the WAN interface.  The extra bytes appeared to be entirely padding, and not necessary.  FreshTomato developers eliminated the padding, which reduced udhcpc's DHCP discovery packet size to only 331 bytes. This 331 byte size eventually became FreshTomato's default setting. This way, udhcpc can successfully obtain a DHCP lease from a provider which might have DHCP relays. However, some users may not be able to obtain a WAN IP address unless they disable this feature. (Default: Enabled).+<del>**Reduce Packet Size:** //udhcpc// (the DHCP client FreshTomato uses to obtain a WAN IP address) has a problem. It has a DHCP discovery packet size 590 bytes long. However, DHCP relay servers can only handle DHCP discovery packets up to 576 bytes. If there are DHCP relay servers between your FreshTomato router and your Internet provider's DHCP server, FreshTomato might fail to acquire a DHCP lease on the WAN interface.  The extra bytes appeared to be entirely padding, and not necessary.  FreshTomato developers eliminated the padding, which reduced udhcpc's DHCP discovery packet size to only 331 bytes. This 331 byte size eventually became FreshTomato's default setting. This way, udhcpc can successfully obtain a DHCP lease from a provider which might have DHCP relays. However, some users may not be able to obtain a WAN IP address unless they disable this feature. (Default: Enabled).</del> Please note this has now been removed from the FT GUI.
  
  
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   * Infinite\\ The Static lease time is infinity   * Infinite\\ The Static lease time is infinity
   * Custom\\ This allows you to enter a custom Static DHCP lease time.   * Custom\\ This allows you to enter a custom Static DHCP lease time.
 +
 +Retaining leases after rebooting router: Please read this [[retain_dhcp_lease_info_after_a_reboot|howto]] for additional information on optional non-volatile dhcp leases.
  
 **Announce IPv6 on LAN (SLAAC): **Enabling this turns on router advertisements for IPv6 //Stateless Address Autoconfiguration (SLAAC)//  protocol. This allows hosts to self-configure an IP address with minimal contact with a server. The client sends out an RS (router solicitation) ICMP packet. The nearest router responds with a RA (router advertisement) packet. The client uses the IPv6 prefix provided in the RA packet as the first 64 bits of its address. It then derives the last 64 bits of its address using the EUI-64 process or a randomization algorithm. **Announce IPv6 on LAN (SLAAC): **Enabling this turns on router advertisements for IPv6 //Stateless Address Autoconfiguration (SLAAC)//  protocol. This allows hosts to self-configure an IP address with minimal contact with a server. The client sends out an RS (router solicitation) ICMP packet. The nearest router responds with a RA (router advertisement) packet. The client uses the IPv6 prefix provided in the RA packet as the first 64 bits of its address. It then derives the last 64 bits of its address using the EUI-64 process or a randomization algorithm.
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 **Custom configuration: **This features allows you to add extra (custom) options to the dnsmasq configuration file. **Custom configuration: **This features allows you to add extra (custom) options to the dnsmasq configuration file.
  
 +===== TFTP Server =====
 +
 +{{:pasted:20230425-142248.png}}
 +
 +**Enable TFTP**: Starts the dnsmasq's internal TFTP server with --tftp-no-fail enabled by default (to prevent dnsmasq issues in case e.g. TFTP root becomes unavailable).
 +
 +**TFTP root path**: Define where the TFTP root is located in the filesystem
 +
 +**PXE on LANx (brx)**: Allows PXE (Pre Boot Execution) on one or more bridges. PXE is designed for diskless clients where a PXE client can just obtain an IP via DHCP and a TFTP location where the booting code is to be found (syslinux is for example a good application for this).
  
 ===== DHCP / DNS Notes ===== ===== DHCP / DNS Notes =====
advanced-dhcpdns.txt · Last modified: 2023/08/05 19:13 by hogwild

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