[OpenWrt-Devel] WAN dhcp client doesnt recognize unplugged cable and doesnt request new IP on replugged

[Hans Dedecker]

On Thu, May 14, 2015 at 10:45 PM, Jakub Jančo <kubco2 at gmail.com> wrote:
> No I havent, I thought it is "Bring on boot" but it is another option. So my
> problem persist.
> config interface 'wan'
>     option ifname 'eth0'
>     option proto 'dhcp'
>     option metric '1'
>
> config interface 'wan6'
>     option ifname '@wan'
>     option proto 'dhcpv6'
>
> This is my wan config, and after turn off and on lan port on remote site, no
> logs entries.
netifd relies on events from the kernel to detect link changes; when
the cable is unplugged the NO_CARRIER flag of eth0 needs to be set
which can be checked via the ip utility (ip link show) or ifconfig
(RUNNING flag not set in this case). Further the cmd ubus call
network.device status dumps the netifd status of the devices
(including the link state).

Hans
>
>
> 2015-05-14 22:29 GMT+02:00 Hans Dedecker <dedeckeh at gmail.com>:
>
>> On Thu, May 14, 2015 at 8:23 PM, Jakub Jančo <kubco2 at gmail.com> wrote:
>> > Thank you for explanation.
>> >
>> > Why does openwrt use force_link on WAN, when it can break internet
>> > connection and remote access?
>> > Or what are advantages of force_link?
>> I don't see any added value of using force_link on a WAN interface
>> unless you would use a static IP address.
>> You verified force_link is enabled on the WAN interface for your board ?
>>
>> Hans
>> >
>> > Thanks.
>> >
>> >
>> > --
>> > S pozdravom Jakub Janco
>> >
>> > 2015-05-14 17:32 GMT+02:00 Hans Dedecker <dedeckeh at gmail.com>:
>> >>
>> >> On Wed, May 13, 2015 at 12:35 PM, Conor O'Gorman <i at conorogorman.net>
>> >> wrote:
>> >> > On 12/05/15 17:57, Jakub Jančo wrote:
>> >> >>
>> >> >> Hello,
>> >> >>
>> >> >> I have tplink 1043nd with BB
>> >> >>
>> >> >> Problem is that I have dhcp client on WAN and if I unplug cable from
>> >> >> WAN, it doesnt change status, give up dhcp address.
>> >> >>
>> >> >> Even worse is that if I plug cable with another end point with
>> >> >> another
>> >> >> network, WAN dhcp client doesnt  pull new IP, I must click on
>> >> >> "Connect"
>> >> >> to refresh dhcp client, then new ip is assigned and internet works.
>> >> >> Or
>> >> >> restart device.
>> >> >
>> >> >
>> >> > Have a look at ifpugd.
>> >> >
>> >> > But maybe netifd should/could/might do something for this scenario?
>> >> >
>> >> > Conor
>> >> > _______________________________________________
>> >> > openwrt-devel mailing list
>> >> > openwrt-devel at lists.openwrt.org
>> >> > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>> >> netifd has support for link state changes; the network interface will
>> >> be brought up/down
>> >> if the link is active/inactive. However if the force_link parameter is
>> >> enabled for a network
>> >> interface netifd will ignore link state changes.
>> >>
>> >> Hans
>> >> _______________________________________________
>> >> openwrt-devel mailing list
>> >> openwrt-devel at lists.openwrt.org
>> >> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>> >
>> >
>
>
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