Editing IRCd (section)

=== G-line ===
{{Redirect|G-line}}
A '''G-line''' or '''global kill line''' (also written '''G:line''') is a global network ban applied to a user; the term comes from [[Undernet]] but on [[DALnet]] a similar concept known as an [[AKill]] was used.{{Citation needed|date=February 2019}}

G-lines are sometimes stored in the [[configuration file]] of the IRCd, although some networks, who handle K-lines through the [[IRC services]], prefer to have them stored in their service's configuration files. Whenever a G-lined person attempts to connect to the IRC network, either the services or the IRC daemon will automatically disconnect the client, often displaying a message explaining the reasoning behind the ban.

G-lines are a variant of K-lines, which work in much the same way, except K-lines only disconnect clients on one server of the network. G-lines are normally applied to a user who has received a K-line on one server but continues to abuse the network by connecting via a different server. G-lines are often regarded as an extreme measure, only to be used in cases of repeated abuse when extensive attempts have been made to reason with the offending user. Therefore, especially on larger networks, often only very high ranking global [[IRC operator]]s are permitted to set them, while K-lines, which are mostly regarded as a local affair, are left to the operators of the individual [[server (computing)|server]] in the network.

G-lines also work slightly differently from K-lines. G-lines are typically set as *@IPaddress or *@host, with the first being the better option. If the *@host option is used, the server must conduct a reverse DNS lookup on the user and then compare the returned host to the hosts in the G-line list. This results in delay, and, if the DNS doesn't return correct results, the banned user may still get on the network.