i can not reach network with Omnitik

hello friends, this is my first post.
i have a problem with my routers. i will tel you my network map to see tell be more clear for you.
i can not reach and ping my sxt or tp-link or ubiquiti antennas.
please how can i reach them.

my network map is:

router 750 ============> Omnitik ===============> SXT ==============> Omnitik ====> SXT
192.168.3.0/24(eth4=>eth1), wlan pppoe(10.10.10.0/24), bridge (sxt =>eth1- eth1 =>omni), wlan pppoe (192.168.1010/24).

i can reach from router 750 (192.168.1.0/24 (eth1)) to 10.10.10.0/24 antennas and
i can not reach from router 750 (192.168.1.0/24 (eth1)), 10.10.10.0/24 (wnal omni client), to 192.168.101.0/24 (wlan omni client)
IMG_20130827_141042.jpg