On Sat, Jul 9, 2016 at 4:37 AM, Alexey Brodkin <Alexey.Brodkin at synopsys.com> wrote: > Hello, > > I was playing with quite simple bridged setup on different boards with > very recent kernels (4.6.3 as of this writing) and found one interesting > behavior that I cannot yet understand and googling din't help here as well. > > My setup is pretty simple: > ------------- ------------------ ------------------------- > | HOST | | "Dumb AP" | | Wireless client | > | with DHCP |<----->(eth0) (wlan0)<----->| attempting to | > | server | | \ br0 / | | get settings via DHCP | > ------------- ------------------ ------------------------- > > * HOST is my laptop with DHCP server that works for sure. > * "Dumb AP" is a separate board (I tried ARM-based Wandboard and ARC-based > AXS10x boards but results are exactly the same) with wired (eth0) and wireless > (wlan0) network controllers bridged together (br0). That "br0" bridge flawlessly > gets its settings from DHCP server on host. > * Wireless client could be either a smatrphone or another laptop etc but > what's important it should be configured to get network settings by DHCP as well. > > So what happens "br0" always gets network settings from DHCP server on HOST. > That's fine. But wireless client only reliably gets settings from DHCP server > if IPv6 is enabled on "Dumb AP" board. If IPv6 is disabled I may see that > wireless client sends "DHCP Discover" then server replies with "DHCP Offer" but > that offer never reaches wireless client. Do you have WDS enabled? If not, DHCP has issues in that scenario: https://wiki.openwrt.org/doc/howto/clientmode Aaron Z
