Issue with forwarding when creates new interface [was USB Tethering and forwarding]

[Mike Tancsa]

On 1/3/2015 9:19 AM, Paul Thornton wrote:
> Hi,
>
> I can also replicate this behaviour on 10.1-RELEASE by simply creating
> an additional vlan interface.  It affects IPv4 and IPv6 forwarding.

Strange, I dont see that on RELENG_10

0{marble}# ifconfig em2 up
0{marble}# ifconfig em2.3 create 1.1.1.2/24
0{marble}# sysctl -a | grep forwarding
net.inet.ip.forwarding: 1
net.inet.ip.fastforwarding: 0
net.inet6.ip6.forwarding: 0
0{marble}# ifconfig vlan4 create 2.2.2.2 vlan 4 vlandev em2
0{marble}# sysctl -a | grep forwarding
net.inet.ip.forwarding: 1
net.inet.ip.fastforwarding: 0
net.inet6.ip6.forwarding: 0
0{marble}#

do you set forwarding via just /etc/sysctl.conf or in /etc/rc.conf via 
ipv6_gateway_enable and gateway_enable. I seem to recall some discussion 
about there being a difference.  Perhaps devd is calling something that 
then fiddles with the setting ignoring whats in sysctl.conf ?

	---Mike



-- 
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada   http://www.tancsa.com/