Date: Tue, 27 Jan 2026 14:56:50 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 292760] [bridge] MTU of bridge inteface limits MTU of bridge-based vlans in despite of vlanmtu flag Message-ID: <bug-292760-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292760 Bug ID: 292760 Summary: [bridge] MTU of bridge inteface limits MTU of bridge-based vlans in despite of vlanmtu flag Product: Base System Version: 15.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: vova@zote.me # uname -a FreeBSD ha.sunrise 15.0-RELEASE FreeBSD 15.0-RELEASE releng/15.0-n280995-7aedc8de6446 GENERIC amd64 # ifconfig bridge1 create mtu 1500 up # ifconfig bridge1.1 create up # ifconfig bridge1.1 bridge1.1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1496 options=0 ether 58:9c:fc:10:e2:e3 groups: vlan vlan: 1 vlanproto: 802.1q vlanpcp: 0 parent interface: bridge1 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> notice MTU less then 1500 on VLAN interface and I cannot raise it - # ifconfig bridge1.1 mtu 1500 ifconfig: ioctl SIOCSIFMTU (set mtu): Invalid argument while on normal interface, it works differently: # ifconfig igb1 up mtu 1500 vlanmtu # ifconfig igb1.20 create # ifconfig igb1.20 igb1.20: flags=1008842<BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 # also, probably, vlanmntu should be default on bridge -- You are receiving this mail because: You are the assignee for the bug.home | help
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