Interesting, I'm actually using an open wifi network at a University so I'm not exactly sure.
I ran "opkg install libpcap1_1.3.0-r5.0_i586.ipk", and got back
"Installing libpcap1 (1..3.0-r5.0) to root...
Configuring libpcap1"
Does that mean it succesfully installed? When I tried configuring tcpdump (which is why I'm installing libpcap) it still gave me the error that local pcap library is not found.