Hi all,

I'm trying to do a differential scan on two hosts
on a closed network.

nessusd -d returns the following:

This is Nessus 2.0.8 for Linux 2.4.20-6
compiled with gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Current setup :
        Experimental session-saving    : enabled
        Experimental KB saving         : enabled
        Thread manager                 : fork
        nasl                           : 2.0.8
        libnessus                      : 2.0.8
        SSL support                    : enabled
        SSL is used for client / server communication
        Running as euid                : 0

I execute nessus (as root) with the following command:

nessus --output-type=xml --batch-mode 192.168.101.81 1241 nessus ****
<targets-file> <results-file>

the .nessusrc file looks like:

# This file was automagically created by nessus
trusted_ca = /usr/local/com/nessus/CA/cacert.pem
nessusd_host = 192.168.101.81
nessusd_user = nessus
paranoia_level = 1
begin(SCANNER_SET)
 10180 = yes
 10277 = no
 10278 = no
 10331 = no
 10335 = yes
 10841 = no
 10336 = no
 10796 = no
 11219 = no
 11840 = yes
end(SCANNER_SET)

begin(SERVER_PREFS)
 max_hosts = 30
 max_checks = 10
 log_whole_attack = yes
 cgi_path = /cgi-bin:/scripts
 port_range = default
 optimize_test = yes
 language = english
 checks_read_timeout = 5
 non_simult_ports = 139, 445
 plugins_timeout = 320
 safe_checks = yes
 auto_enable_dependencies = no
 use_mac_addr = no
 save_knowledge_base = yes
 kb_restore = no
 only_test_hosts_whose_kb_we_dont_have = no
 only_test_hosts_whose_kb_we_have = no
 kb_dont_replay_scanners = no
 kb_dont_replay_info_gathering = no
 kb_dont_replay_attacks = no
 kb_dont_replay_denials = no
 kb_max_age = 864000
 plugin_upload = no
 plugin_upload_suffixes = .nasl, .inc
 slice_network_addresses = no
 save_session = yes
 save_empty_sessions = no
 host_expansion = ip
 ping_hosts = no
 reverse_lookup = no
 detached_scan = no
 continuous_scan = no
 unscanned_closed = no
 diff_scan = yes
end(SERVER_PREFS)

begin(SERVER_INFO)
 server_info_nessusd_version = 2.0.8
 server_info_libnasl_version = 2.0.8
 server_info_libnessus_version = 2.0.8
 server_info_thread_manager = fork
 server_info_os = Linux
 server_info_os_version = 2.4.20-6
end(SERVER_INFO)

begin(RULES)
end(RULES)

<remainder of file not shown, for brevity>

The diff_scan = yes line was manually edited from
"no" to "yes", before making the runs.

I get the same results on successive runs, but I would
expect the runs subsequent to the first to show little
or no difference, but I am getting 156 ports shown
in the results XML file.

What am I doing wrong, or what is wrong with my
expectations?

Thanks, in advance, for any light you can shed on this.

David Hoos

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