FortiOS 7.6.8: ARP announcement packets dropped on virtual-wire-pair ports after upgrade
Summary
Fortinet lists a known issue in the FortiOS 7.6.8 release notes (Bug ID 1353401). After an upgrade to v7.6.8 or 8.0.1, ARP announcement packets are dropped on virtual-wire-pair member ports. The issue is confirmed by the vendor; no fix or workaround is documented in the source.
Symptoms
ARP (Address Resolution Protocol) announcement packets are dropped on member ports of a virtual wire pair after the upgrade. The source gives no further details on the effects.
Affected
- FortiOS 7.6.8
- FortiOS 8.0.1
- Only FortiGate units with virtual-wire-pair member ports (Bug ID 1353401, area: System)
Workaround
No workaround known.
Fix
Not fixed yet.
Recommendation
If you use virtual wire pairs, postpone the upgrade to 7.6.8 or 8.0.1 or test it in a lab first. Check whether ARP announcements (for example during failover of devices behind the pair) are affected. Watch the Fortinet release notes for a fix.
Sources
- FortiOS 7.6.8 Release Notes: Known issues Vendor · docs.fortinet.com
Compiled from the sources listed and translated with AI (Claude); status and dates come from the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 22:02.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
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