Picking a site-to-site tunnel between two offices, IPsec or WireGuard.
IPsec is the classic choice, supported by every firewall and well tested, but painful to debug when phase-1 or phase-2 do not match across vendors. WireGuard is faster, simpler to configure and steadier over flaky uplinks, but not every firewall supports it and you handle key management yourself.
Try this first
- 1Same firewall brand on both ends? IPsec is easy, use the wizard, no reason to switch.
- 2Different brands? IPsec hurts, WireGuard is usually cleaner, provided both ends support it (OPNsense, MikroTik, recent Fortinet, UniFi UDM).
- 3Dynamic IP on one side? WireGuard tolerates it better since it pairs statelessly, IPsec needs DDNS or a dynamic-IP-aware setup.
- 4Latency-sensitive traffic (VoIP, RDP)? Both work, but actually test, some IPsec stacks have default MTU issues that hang sessions.
- 5Make one side the 'master' for key rotation, put a 12-month calendar reminder on it, otherwise nobody rotates keys.
When to bring us in
You must meet FIPS-140 or a vendor audit requires certified crypto: WireGuard usually lacks that certification, go with IPsec on a certified firewall.
See also
- Wi-Fi drops randomly across the officeFirst rule out whether it is the access points or the internet connection itself. Different fix.
- One room or corner has no or bad Wi-FiNot always "add another AP"; often one is poorly positioned, or there is a metal wall in the way.
- Internet is suddenly slow for everyoneThree suspects: your provider, a colleague soaking the line, or a backup or update kicking in unexpectedly.
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