https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210747
Bug ID: 210747
Summary: Routing table screwed up when adding routes for IPv6
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: tue...@freebsd.org
Steps to reproduce:
1. Create an interface
sudo ifconfig tun0 create inet6 fd3d:fa7b:d17d::1/48
2. Check routing table
netstat -nrfinet6
Routing tables
Internet6:
Destination Gateway Flags Netif
Expire
::/96 ::1 UGRS lo0
::1 link#2 UH lo0
::ffff:0.0.0.0/96 ::1 UGRS lo0
fd3d:fa7b:d17d::/48 link#3 U tun0
fd3d:fa7b:d17d::1 link#3 UHS lo0
fe80::/10 ::1 UGRS lo0
fe80::%em0/64 link#1 U em0
fe80::20c:29ff:fe8a:8910%em0 link#1 UHS lo0
fe80::%lo0/64 link#2 U lo0
fe80::1%lo0 link#2 UHS lo0
fe80::%tun0/64 link#3 U tun0
fe80::20c:29ff:fe8a:8910%tun0 link#3 UHS lo0
ff02::/16 ::1 UGRS lo0
3. Add route
sudo route add -inet6 2001:DB8::1/32 -interface tun0 fd3d:fa7b:d17d::2
add net 2001:DB8::1/32: gateway tun0
4. Check routing table
[freebsd11:~] tuexen% netstat -nrfinet6
Routing tables
Internet6:
Destination Gateway Flags Netif
Expire
::/96 ::1 UGRS lo0
::1 link#2 UH lo0
::ffff:0.0.0.0/96 ::1 UGRS lo0
illegal prefixlen
2001:838::/0 tun0 US tun0
fd3d:fa7b:d17d::/48 link#3 U tun0
fd3d:fa7b:d17d::1 link#3 UHS lo0
fe80::/10 ::1 UGRS lo0
fe80::%em0/64 link#1 U em0
fe80::20c:29ff:fe8a:8910%em0 link#1 UHS lo0
fe80::%lo0/64 link#2 U lo0
fe80::1%lo0 link#2 UHS lo0
fe80::%tun0/64 link#3 U tun0
fe80::20c:29ff:fe8a:8910%tun0 link#3 UHS lo0
ff02::/16 ::1 UGRS lo0
The problem is with "illegal prefixlen" and the network being displayed
2001:838::/0.
The problem does not occur when using
sudo route add -inet6 2001:DB8::1/32 fd3d:fa7b:d17d::2
in step 3.
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