https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248005
Bug ID: 248005
Summary: nd6 initializes nd_ifinfo->maxmtu = 0 on newly
inserted network interfaces
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 216476
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=216476&action=edit
Proposed patch
The issue is that if_attach is called prior to setting the interface MTU, which
will cause nd6_ifattach to attach the interface with an uninitialized MTU
value(0).
This issue will typically go unnoticed unless you start adding new network
interface after the system has finished starting-up since drivers are
mounted/attached then at some time after domainattach will explicitly be called
by:
SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
if_attachdomain, NULL);
To reproduce the observed behaviour:
1. Start-up without a USB Ethernet device plugged in
2. Insert one and load the driver.
3. ndp -i <ifname> will show maxmtu=0 and not maxmtu=1500.
I've attached a diff that will resolve the issue.
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