[Snort-users] Stream5 Reassembly ports

NIDS TEAM nidsteam at ...11827...
Tue May 27 05:15:16 EDT 2014


Hi again

Does anybody know why I am getting this sort of log messages:

snort[11777]: S5: Session exceeded configured max bytes to queue 2097152
using 2097254 bytes (client queue). 10.0.0.12 61326 --> 10.0.0.13 3299 (0)
: LWstate 0x40 LWFlags 0x2102

With the following Stream5 configuration:

preprocessor stream5_global: track_tcp yes, \
                             track_udp yes, \
                             track_icmp no, \
                             max_tcp 65536, \
                             max_udp 65536, \
                             memcap 536870912
preprocessor stream5_tcp: policy windows, \
                          timeout 60, \
                          max_queued_bytes 2097152, \
                          max_queued_segs 5242, \
                          dont_store_large_packets, \
                          ports client 21 22 23 25 42 53 79 109 110 111 113
119 135 136 137 139 143 \
                                       161 445 513 514 587 593 691 1433
1521 1741 2100 3306 6070 6665 \
                                       6666 6667 6668 6669 7000 8181 32770
32771 32772 32773 32774 \
                                       32775 32776 32777 32778 32779, \
                          ports both   80 81 311 383 443 465 563 591 593
636 901 989 992 993 994 995 1220 \
                                       1414 1830 2301 2381 2809 3037 3128
3702 4343 4848 5250 6988 7907 7001 \
                                       7144 7145 7510 7802 7777 7779 7801
7900 7901 7902 7903 7904 7905 7906 \
                                       7908 7909 7910 7911 7912 7913 7914
7915 7916 7917 7918 7919 7920 8000 \
                                       8008 8014 8028 8080 8085 8088 8090
8118 8123 8180 8243 8280 8300 8800 8888 \
                                       8899 9000 9060 9080 9090 9091 9443
9999 11371 34443 34444 41080 50002 \
                                       55555


Both source and destination ports are not listed in the configuration. And
it is TCP traffic for sure. Shouldn't there only be reassembly on the given
ports?
Besides that, does anybody have a good rule of thumb for the memcap vs
max_tcp value?

Thanks for your inputs
guh
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