A well-timed distributed botnet can disrupt channels easily with massive /join floods, exacerbated by additional annoyance from the resulting /parts.
No IRC client script can adequately prevent this because it's unable to act fast enough. For this reason, it is recommended to maintain a reasonable channel limit through channel mode +l to limit the exposure to large /join floods.
Floating Limit
Add a per-channel feature called floatlim to maintain a floating channel limit. Use some sensible default behaviour settings:
Parameter
Default
Description
FLOATMARGIN
10
Raise limit by this amount above the channel count
FLOATGRACE
3
Only make limit changes when usercount vs chanlimit difference is within this value
FLOATPERIOD
60
Frequency to periodically decide if limit changes are needed
Usage
Enable or disable floatlim feature:
modchan <chan> floatlim <on|off>
Frequency (in secs) to check for limit changes:
modchan <chan> floatperiod <secs>
Margin above current user count to set channel limit:
modchan <chan> floatmargin <num>
Only change limit when difference between usercount and current limit is within this grace value:
modchan <chan> floatgrace <num>
Recommendation
It is recommended that FLOATLIM is always turned on to eliminate the risk of the bot being flooded off from a large /join flood.
Preventing the bot from flooding off would mean sacrificing performance with smaller floods, which isn't acceptable when floating channel limits would better address this.
Unless cfg(float:auto) is disabled, floatlim will be automatically enabled for newly registered channels.
empus
commented
3 months ago
Background
A well-timed distributed botnet can disrupt channels easily with massive
/joinfloods, exacerbated by additional annoyance from the resulting/parts.No IRC client script can adequately prevent this because it's unable to act fast enough. For this reason, it is recommended to maintain a reasonable channel limit through channel mode
+lto limit the exposure to large/joinfloods.Floating Limit
Add a per-channel feature called
floatlimto maintain a floating channel limit. Use some sensible default behaviour settings:Usage
Enable or disable
floatlimfeature:Frequency (in secs) to check for limit changes:
Margin above current user count to set channel limit:
Only change limit when difference between usercount and current limit is within this grace value:
Recommendation
It is recommended that
FLOATLIMis always turned on to eliminate the risk of the bot being flooded off from a large/joinflood.Preventing the bot from flooding off would mean sacrificing performance with smaller floods, which isn't acceptable when floating channel limits would better address this.
Unless
cfg(float:auto)is disabled,floatlimwill be automatically enabled for newly registered channels.