[Bug 292319] [network: fibs] traffic comes from the wrong fib in some cases.
Date: Wed, 11 Mar 2026 06:26:36 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292319
--- Comment #4 from William Brown <william@firstyear.id.au> ---
Please answer the questions below to help me reproduce:
1. sysctl output of your:
1.1. net.inet.ip.forwarding
net.inet.ip.forwarding: 1
1.2. net.inet.icmp.drop_redirect
net.inet.icmp.drop_redirect: 0 (during the issue)
2. what is your openvpn configuration?
2.1. is it client or server?
client
2.2. any `dev` interface specified?
# openvpn_instance.conf
dev-type tun
dev tun5
# /etc/rc.conf
cloned_interfaces="... tun5"
ifconfig_tun5="fib 1"
2.3. what is your `topology` configuration? subnet? p2p?
subnet
2.4. on ifconfig -v tun5, what is your driver name? openvpn? tun?
tun5: flags=1008051<UP,POINTOPOINT,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu
1500
options=4080000<LINKSTATE,MEXTPG>
inet 10.149.210.138 --> 10.149.210.137 netmask 0xffffffff
inet6 fe80::5a9c:fcff:fe0a:5755%tun5 prefixlen 64 scopeid 0xb
inet6 2a07:de40:b2bf:1b::10a1 prefixlen 64
groups: tun
fib: 1
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
Opened by PID 81039
drivername: tun5
3. netstat -rn4 output of both fibs after before and after receiving redirect:
3.1. netstat -rn4F1
3.2. netstat -rn4F5
BEFORE:
roxie% sudo -s
roxie# netstat -rn4F1
Routing tables (fib: 1)
Internet:
Destination Gateway Flags Netif Expire
default 172.24.17.1 UGS vtnet1
10.0.0.0/8 link#11 US tun5
10.149.242.41 link#11 UH tun5
10.149.242.42 link#7 UHS lo0
127.0.0.1 link#7 UHS lo0
137.65.0.0/16 link#11 US tun5
147.2.0.0/16 link#11 US tun5
149.44.0.0/16 link#11 US tun5
151.155.128.0/17 link#11 US tun5
164.99.0.0/16 link#11 US tun5
172.24.17.0/24 link#2 U vtnet1
172.24.17.24 link#7 UHS lo0
roxie# netstat -rn4F5
Routing tables (fib: 5)
Internet:
Destination Gateway Flags Netif Expire
default 172.24.17.1 UGS vtnet5
127.0.0.1 link#7 UHS lo0
172.24.17.0/24 link#6 U vtnet5
172.24.17.26 link#7 UHS lo0
AFTER:
roxie# netstat -rn4F1
Routing tables (fib: 1)
Internet:
Destination Gateway Flags Netif Expire
default 172.24.17.1 UGS vtnet1
10.0.0.0/8 link#11 US tun5
10.149.242.41 link#11 UH tun5
10.149.242.42 link#7 UHS lo0
127.0.0.1 link#7 UHS lo0
137.65.0.0/16 link#11 US tun5
147.2.0.0/16 link#11 US tun5
149.44.0.0/16 link#11 US tun5
151.155.128.0/17 link#11 US tun5
164.99.0.0/16 link#11 US tun5
172.24.17.0/24 link#2 U vtnet1
172.24.17.24 link#7 UHS lo0
roxie# netstat -rn4F5
Routing tables (fib: 5)
Internet:
Destination Gateway Flags Netif Expire
default 172.24.17.1 UGS vtnet5
127.0.0.1 link#7 UHS lo0
172.24.17.0/24 link#6 U vtnet5
172.24.17.26 link#7 UHS lo0
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