IPTables
Prev | Chapter 10. Firewall Supported Log Formats | Next

## IPTables

IPTables will log packets marked for logging through syslog (actually the kernel log buffer which is usually sent to syslog). Lire expects the logs in the form of a syslog log file.

A problem with logs from IPTables is that we have no real idea of what happened with the packet (was it denied or permitted). The logging module of IPtables permit to tag each logged packet with a prefix. Lire will interpret packets having a prefix which contains the strings `denied`, `drop`, `deny` or `reject` as denied packets. All other packets will have an unknown action value (`-`).

Example 10.4. IPTables Log Sample

    Sep 21 11:45:17 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.2 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=38365 DF \
        PROTO=TCP SPT=3117 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0
    Sep 21 11:45:20 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.2 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=38478 DF \
        PROTO=TCP SPT=3117 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0
    Sep 21 11:45:26 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.2 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=38680 DF \
        PROTO=TCP SPT=3117 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0
    Sep 21 11:52:46 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.3 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=54122 DF \
        PROTO=TCP SPT=4532 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0
    Sep 21 11:52:49 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.3 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=54222 DF \
        PROTO=TCP SPT=4532 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0
    Sep 21 11:52:55 lire kernel:  Packet-drop  IN=eth0 OUT=eth0 SRC=10.0.0.1 \
        DST=10.0.0.3 LEN=48 TOS=0x00 PREC=0x00 TTL=113 ID=54443 DF \
        PROTO=TCP SPT=4532 DPT=80 WINDOW=16384 RES=0x00 SYN URGP=0

Prev | Up | Next
IP Filter | Home | WebTrends Enhanced Log Format