Que tipo de dispositivo você está usando? Para generic
ar71xx
devices tente usar as seguintes fontes (na página do OpenWrt OPKG Techref ) :
src/gz base https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/base
src/gz luci https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/luci
src/gz management https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/management
src/gz oldpackages https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/oldpackages
src/gz packages https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/packages
src/gz routing https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/routing
src/gz telephony https://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/telephony