X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=pve-firewall.adoc;h=07813344860213b086ee43b619e1ab44ddfefcc2;hb=7d6078845fa6a3bd308c7dc843273e56be33f315;hp=acaca95934ce161caebc97757863d95441d6c62d;hpb=b3234584397d064a8f75f4b01b08da6879563549;p=pve-docs.git

diff --git a/pve-firewall.adoc b/pve-firewall.adoc
index acaca95..0781334 100644
--- a/pve-firewall.adoc
+++ b/pve-firewall.adoc
@@ -35,7 +35,7 @@ containers. Features like firewall macros, security groups, IP sets
 and aliases help to make that task easier.
 
 While all configuration is stored on the cluster file system, the
-`iptables`-based firewall runs on each cluster node, and thus provides
+`iptables`-based firewall service runs on each cluster node, and thus provides
 full isolation between virtual machines. The distributed nature of
 this system also provides much higher bandwidth than a central
 firewall solution.
@@ -74,9 +74,9 @@ You can configure anything using the GUI (i.e. *Datacenter* -> *Firewall*,
 or on a *Node* -> *Firewall*), or you can edit the configuration files
 directly using your preferred editor.
 
-Firewall configuration files contains sections of key-value
+Firewall configuration files contain sections of key-value
 pairs. Lines beginning with a `#` and blank lines are considered
-comments. Sections starts with a header line containing the section
+comments. Sections start with a header line containing the section
 name enclosed in `[` and `]`.
 
 
@@ -404,6 +404,44 @@ If you want to see the generated iptables rules you can use:
 
  # iptables-save
 
+Logging of firewall rules
+-------------------------
+
+By default, logging of traffic filtered by the firewall rules is disabled. To
+enable logging for the default firewall rules, the log-level for incommig and
+outgoing traffic has to be set in the firewall `Options` tab for the host and/or
+the VM/CT firewall.
+Logging of dropped packets is rate limited to 1 packet per second in order to
+reduce output to the log file.
+Further, only some dropped or rejected packets are logged for the standard rules.
+
+// TODO: describe standard/default rules and note which of them get logged
+
+In order to log packets filtered by user-defined firewall rules, it is possible
+to set a log-level parameter for each rule individually.
+This allows to log in a fine grained manner and independent of the log-level
+defined for the standard rules in the firewall `Options`.
+
+The log level for the rule can also be set via the firewall configuration file by
+appending a `-log <loglevel>` to the selected rule.
+Here, `<loglevel>` is one of the following flags:
+`nolog, emerg, alert, crit, err, warning, notice, info, debug`
+
+For example, the following two are ident:
+
+----
+IN REJECT -p icmp -log nolog
+IN REJECT -p icmp
+----
+
+whereas
+
+----
+IN REJECT -p icmp -log debug
+----
+
+produces a log output flagged with the `debug` level.
+
 
 Tips and Tricks
 ---------------