[Winpcap-users] Filtering expression syntax

[Ziara .]

Hi.
 
I'm using filtering expression syntax. And I was wondering why if a write: ip proto icmp in:
 
pcap_compile(adhandle, &fcode, "ip proto icmp", 1, netmask) 
 
is a invalid expression syntax. Which one is the correct form to filter icmp packets?
 
Thanks in advanced.
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