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Clearly there are many more combinations possible.
It is therefore possible to write rules which log inbound and outbound traffic, or to
construct several rules which differentiate between the two.
Rate Limiting
iptables has the facility for rate-limiting the log messages that are generated, in order to
avoid denial of service issues arising out of logging these access attempts. To achieve
this, use the following option:
--limit rate
rate is the maximum average matching rate, specified as a number with an
optional /second, /minute, /hour, or /day suffix. The default is 3/hour.
--limit-burst number
number is the maximum initial number of packets to match. This number gets
recharged by one every time the limit specified above is not reached, up to this
number. The default is 5.
iptables has many more options. Perform a web search for manpage iptables to find the
relevant documentation.
The LOG rules configured by default (e.g. Default Deny:) are all limited to:
--limit 3/hour --limit-burst 5
Administrative Access Logging
When a user tries to log onto the SnapGear Management Console web administration
pages, one of the following log messages appears:
Jan 30 03:00:18 2000 boa: Authentication successful for root from
10.0.0.2
Jan 30 03:00:14 2000 boa: Authentication attempt failed for root
from 10.0.0.2
Appendix B – System Log
101