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ipfw [2010/08/26 02:19] k2patel |
ipfw [2010/08/26 02:20] k2patel |
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==== Common Attack Prevention ==== | ==== Common Attack Prevention ==== | ||
- | # XMAS tree | + | **# XMAS tree** |
<code bash> | <code bash> | ||
ipfw add 00011 deny log tcp from any to any in tcpflags fin,psh,urg recv em0 | ipfw add 00011 deny log tcp from any to any in tcpflags fin,psh,urg recv em0 | ||
</code> | </code> | ||
- | # NULL scan (no flag set at all) | + | **# NULL scan (no flag set at all)** |
<code bash> | <code bash> | ||
ipfw add 00012 deny log tcp from any to any in tcpflags !fin,!syn,!rst,!psh,!ack,!urg recv em0 | ipfw add 00012 deny log tcp from any to any in tcpflags !fin,!syn,!rst,!psh,!ack,!urg recv em0 | ||
</code> | </code> | ||
- | # SYN flood (SYN,FIN) | + | **# SYN flood (SYN,FIN)** |
<code bash> | <code bash> | ||
ipfw add 00013 deny log tcp from any to any in tcpflags syn,fin recv em0 | ipfw add 00013 deny log tcp from any to any in tcpflags syn,fin recv em0 | ||
</code> | </code> | ||
- | # Stealth FIN scan (FIN,RST) | + | **# Stealth FIN scan (FIN,RST)** |
<code bash> | <code bash> | ||
ipfw add 00014 deny log tcp from any to any in tcpflags fin,rst recv em0 | ipfw add 00014 deny log tcp from any to any in tcpflags fin,rst recv em0 | ||
</code> | </code> | ||
- | # forced packet routing | + | **# forced packet routing** |
<code bash> | <code bash> | ||
ipfw add 00015 deny log ip from any to any in ipoptions ssrr,lsrr,rr,ts recv em0 | ipfw add 00015 deny log ip from any to any in ipoptions ssrr,lsrr,rr,ts recv em0 | ||
</code> | </code> | ||
- | # ACK scan (ACK,RST) | + | **# ACK scan (ACK,RST)** |
<code bash> | <code bash> | ||
ipfw add 00016 deny log tcp from any to any in tcpflags ack,rst recv em0 | ipfw add 00016 deny log tcp from any to any in tcpflags ack,rst recv em0 | ||
</code> | </code> | ||
- | #deny fragments as bogus packets | + | **#deny fragments as bogus packets** |
<code bash> | <code bash> | ||
ipfw add 00017 deny log all from any to any frag in via | ipfw add 00017 deny log all from any to any frag in via | ||
</code> | </code> |