It sounds like that your default inet route is overwritten after dhclient on
vlan1 is issued. Did you have a look at the route table before and after each
call of dhclient?
> On 13 Jul 2014, at 02:49, Rogier Krieger <rkrie...@gmail.com> wrote:
>
> Dear list,
>
> as my ISP is migrating to a new network setup, I'm forced to tinker with my
> local setup. Unfortunately, I'm struggling to get two interfaces (vlan0,
> vlan1) working simultaneously with DHCP.
>
> Separately, they work fine. Together, vlan1 drops my internet connection
> (vlan0); the latter won't return until I manually re-issue dhclient vlan0.
> Upon lease renewal, the same occurs, lest I kill the dhclient instance for
> vlan1.
>
> I wonder if I'm doing something silly. Is the having two simultaneous
> dhclient instances a supported setup? The second instance is for an IPTV
> set-top-box (STB) that I'd like to keep away from my regular LAN, hence the
> routing domains.
>
> I've disabled PF while trying to get this working, so as to minimise the
> amount of things I can do wrong.
>
> Does anyone have a cluebat for me? Insight greatly appreciated.
>
> Regards,
>
>
>
> Background:
> It's a FttH link that provides two tagged networks (vlan 34 for IP; vlan 4
> for IPTV). The latter provides an private range address (in 10.10.12.0/22)
> for a set-top-box.
>
> For the STB:
> - IPTV Traffic is to be NATed to vlan4 (towards the 10.10.12.0/22 and
> 185.6.48.0/26 ranges)
> - Other/Internet traffic (e.g. program guides) needs to travel via the
> regular IP uplink (vlan 34) and should be NATed there
>
>
>
> # cat /etc/dhclient.conf
> supersede host-name "fluor";
> prepend domain-name-servers "27.0.0.1;
>
> interface "vlan1" {
> #ignore routers; # vlan1 is in rdomain 1; default route won't hurt us
> }
>
>
> # cat /etc/hostname.em0
> description "internal"
> -inet6
> up
>
> # cat /etc/hostname.em1
> description "uplink"
> -inet6
> up
>
> # cat /etc/hostname.vlan0
> description "ip (uplink)"
> vlan 34 vlandev em1
> dhcp
> -inet6
>
> # cat /etc/hostname.vlan1
> description "tv (uplink)"
> rdomain 1
> group tv
> vlan 4 vlandev em1
> dhcp
> -inet6
>
> # cat /etc/hostname.vlan52
> description "tv (downlink)
> rdomain 1
> group tv
> vlan 52 vlandev em0
> inet 10.0.52.1/24
> -inet6
>
>
>
>
> --
> If you don't know where you're going, any road will get you there.
