I am having issues somewhat similar to what Ravi was seeing. I want to enable
the "Ping the remost host" option to do an ICMP ping because I'm scanning
large subnets and want to move on quickly if something doesn't appear to be
up. The "Ping the remote host" option calls ping_host.nasl, and using
Ethereal I found what seems to be the problem. Nessus sends out an ICMP echo
request, but hosts never reply, apparently because the IP header checksum in
the ICMP packet is 0! The relevant part of ping_host.nasl is below (sorry if
the formatting is goofy):
ip = forge_ip_packet(ip_v:4, ip_hl:5, ip_tos:0,ip_off:0,ip_len:20,
ip_p:IPPROTO_ICMP, ip_id:id, ip_ttl:0x40,
ip_src:this_host());
icmp = forge_icmp_packet(ip:ip, icmp_type:8, icmp_code:0,
icmp_seq: 1, icmp_id:1);
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