First thing I'd look at is firewalls on either side, or in the router (you don't state if you are using WiFi on both sides, or cabled to router)
Many WiFi routers are often configured to only pass traffic from LAN to WAN and back, and block LAN<>LAN traffic -- a configuration useful for public WiFi access points as it gives some sense of privacy between random users. Mine, OTOH, has separate "HOME" and "GUEST" SSIDs (with associated passwords), where Guest can be configure for "Internet Only" or "Internet and LAN".
After checking the router, I'd check the firewalls on each computer. It is possible to have firewalls configured to pass Internet, but for some reason block LAN traffic.
What does traceroute/tracert show?
As an example -- my small (cabled) web-server (presuming the dynamic DNS works and ATT doesn't block it from outside) box can ping my (WiFi) Pi-Star box. BUT the Pi-Star can't ping back...
microdiversity (server) on cable to router
Code: Select all
md_admin@microdiversity:~$ ping pi-star-3b
PING pi-star-3b.attlocal.net (192.168.1.79) 56(84) bytes of data.
64 bytes from pi-star-3b.attlocal.net (192.168.1.79): icmp_seq=1 ttl=64 time=6.24 ms
64 bytes from pi-star-3b.attlocal.net (192.168.1.79): icmp_seq=2 ttl=64 time=6.12 ms
64 bytes from pi-star-3b.attlocal.net (192.168.1.79): icmp_seq=3 ttl=64 time=5.55 ms
64 bytes from pi-star-3b.attlocal.net (192.168.1.79): icmp_seq=4 ttl=64 time=5.66 ms
64 bytes from pi-star-3b.attlocal.net (192.168.1.79): icmp_seq=5 ttl=64 time=5.49 ms
^C
--- pi-star-3b.attlocal.net ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 10ms
rtt min/avg/max/mdev = 5.492/5.814/6.241/0.307 ms
md_admin@microdiversity:~$
md_admin@microdiversity:~$ traceroute pi-star-3b
traceroute to pi-star-3b (192.168.1.79), 30 hops max, 60 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
<SNIP REST>
Pi-Star node on WiFi
Code: Select all
pi-star@pi-star-3b(ro):~$ ping microdiversity
PING microdiversity.attlocal.net (192.168.1.252) 56(84) bytes of data.
^C
--- microdiversity.attlocal.net ping statistics ---
27 packets transmitted, 0 received, 100% packet loss, time 85ms
pi-star@pi-star-3b(ro):~$
pi-star@pi-star-3b(ro):~$ traceroute microdiversity
traceroute to microdiversity (192.168.1.252), 30 hops max, 60 byte packets
send: Operation not permitted
pi-star@pi-star-3b(ro):~$ sudo traceroute microdiversity
traceroute to microdiversity (192.168.1.252), 30 hops max, 60 byte packets
send: Operation not permitted