====== OPNsense Router and Firewall ======

**Home**: https://opnsense.org/

**Documentation**: https://docs.opnsense.org

**Forums**: https://forum.opnsense.org

**NAT**: https://docs.netgate.com/pfsense/en/latest/config/advanced-firewall-nat.html

<note tip>**OPNsense** was originally forked from the commercial **PFsense** router/firewall.  When researching issues, information regarding PFsense may apply to OPNsense and vice-versa.</note>









===== VoIP =====

**Configuring NAT for VoIP Phones**: https://docs.netgate.com/pfsense/en/latest/recipes/nat-voip-phones.html

**Configuring NAT for a VoIP PBX**: https://docs.netgate.com/pfsense/en/latest/recipes/nat-voip-pbx.html

**Settings for VoIP**: https://support.onsip.com/hc/en-us/articles/204029430-PFSense-Firewall-Settings-for-VoIP

**UDP Timeouts**: https://www.reddit.com/r/opnsense/comments/vr1zop/firewall_optimization_setting/

Research before using:

  * **Firewall -> Settings -> Normalization** (Enable IP Do-Not-Fragment)
  * **Firewall -> Settings -> Firewall Optimization** (Change to Conservative)

===== Troubleshooting =====

**Low Throughput**: https://forum.proxmox.com/threads/proxmox-pfsense-vm-extreme-low-throughput.67281/post-526005