No reply to ICMP /ping

hi there,
i'm experiencing strange issue mac book pro snow leopard.

mac won't reply ping commands issued on other hosts within same network.

ip stand point of view hosts within same subnet 192.168.1.0/ 255.255.255.240.

pinging 2 other machines mac's ip address , no reply @ all. when pinging mac other hosts, icmp replies have switched off firewall, , while firewall on have unchecked stealth mode, no results.

i've created new location , no icmp replies when pinging mac 's ip address other machines within network.

in attempt isolate issue directly connected mac computer via crossover cable, , got same symptoms

there unix command reset tcp ip socket. icmp part of tcp ip stack , reinstalling or resetting socket should fix problem...i guess ) or there command in unix can force deactivating firewall.

reinstalling whole os or deleting system preferences settings using hammer in stead of scalpel.

thank in advance advice , patience.

 

more details.

other machines? they have firewall getting in way?

b

 

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