My iMac and MacBook can't see each other on the same wifi network

I've got a 2010 MacBook running Snow Leopard and a late 2009 iMac running Lion. They are connected wirelessly to a Belkin N+ router and can ping one another by IP. They can also share a mouse using Synergy by IP. They can't resolve one another's hostnames (<compname>.local).
Unfortunately, they don't show up in each other's local network in Finder. They have recognized each other twice in the few days I've had this set up but those times were directly after a reboot of both machines and even then, only one machine could see the other. One time it was iMac -> MacBook, the other it was MacBook -> iMac.

More information: After restarting my router and upgrading the firmware, the my MacBook was able to see my iMac (ping it directly immediately) and it showed up in the list of Shared devices.
My iMac was able to ping the MacBook eventually (after 22 timeouts, it eventually got a few high round-trip pings that lowered shortly thereafter), but it is still unable to see the MacBook in the Shared devices list.
I was, however, able to mount it with Finder > Connect to Server > afp://192.168.2.3. This is useful progress, but it's not ideal because I use some software like "teleport" that still doesn't recognize my MacBook is a shared Mac. The teleport software on my MacBook does recognize the iMac as a shared Mac.
Here's the output for my attempted ping from the iMac to the MacBook:
ping 192.168.2.3
PING 192.168.2.3 (192.168.2.3): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 22
64 bytes from 192.168.2.3: icmp_seq=11 ttl=64 time=12338.226 ms
64 bytes from 192.168.2.3: icmp_seq=12 ttl=64 time=11341.133 ms
64 bytes from 192.168.2.3: icmp_seq=13 ttl=64 time=10341.974 ms
64 bytes from 192.168.2.3: icmp_seq=14 ttl=64 time=11452.557 ms
64 bytes from 192.168.2.3: icmp_seq=15 ttl=64 time=10718.590 ms
64 bytes from 192.168.2.3: icmp_seq=16 ttl=64 time=9799.987 ms
64 bytes from 192.168.2.3: icmp_seq=17 ttl=64 time=8798.967 ms
64 bytes from 192.168.2.3: icmp_seq=18 ttl=64 time=7803.687 ms
64 bytes from 192.168.2.3: icmp_seq=19 ttl=64 time=6802.503 ms
64 bytes from 192.168.2.3: icmp_seq=20 ttl=64 time=5818.710 ms
64 bytes from 192.168.2.3: icmp_seq=21 ttl=64 time=4818.158 ms
64 bytes from 192.168.2.3: icmp_seq=22 ttl=64 time=3816.990 ms
64 bytes from 192.168.2.3: icmp_seq=23 ttl=64 time=2815.664 ms
64 bytes from 192.168.2.3: icmp_seq=24 ttl=64 time=1828.492 ms
64 bytes from 192.168.2.3: icmp_seq=25 ttl=64 time=828.307 ms
64 bytes from 192.168.2.3: icmp_seq=26 ttl=64 time=9.865 ms

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