
# OPNsense by SNMP

## Overview

Template for monitoring OPNsense by SNMP

## Requirements

Zabbix version: 6.0 and higher.

## Tested versions

This template has been tested on:
- OPNsense 22.1.9

## Configuration

> Zabbix should be configured according to the instructions in the [Templates out of the box](https://www.zabbix.com/documentation/6.0/manual/config/templates_out_of_the_box) section.

## Setup

1. Enable bsnmpd daemon by creating new config file "/etc/rc.conf.d/bsnmpd" with the following content:  
bsnmpd_enable="YES"
2. Uncomment the following lines in "/etc/snmpd.config" file to enable required SNMP modules:  
begemotSnmpdModulePath."hostres" = "/usr/lib/snmp_hostres.so"  
begemotSnmpdModulePath."pf"     = "/usr/lib/snmp_pf.so"
3. Start bsnmpd daemon with the following command:  
/etc/rc.d/bsnmpd start
4. Setup a firewall rule to get access from Zabbix proxy or Zabbix server by SNMP (https://docs.opnsense.org/manual/firewall.html).
5. Link the template to a host.


### Macros used

|Name|Description|Default|
|----|-----------|-------|
|{$IF.ERRORS.WARN}|<p>Threshold of error packets rate for warning trigger. Can be used with interface name as context.</p>|`2`|
|{$IF.UTIL.MAX}|<p>Threshold of interface bandwidth utilization for warning trigger in %. Can be used with interface name as context.</p>|`90`|
|{$IFCONTROL}|<p>Macro for operational state of the interface for link down trigger. Can be used with interface name as context.</p>|`1`|
|{$NET.IF.IFADMINSTATUS.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`^.*`|
|{$NET.IF.IFADMINSTATUS.NOT_MATCHES}|<p>Ignore down(2) administrative status.</p>|`^2$`|
|{$NET.IF.IFALIAS.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFALIAS.NOT_MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$NET.IF.IFDESCR.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFDESCR.NOT_MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$NET.IF.IFNAME.NOT_MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`(^pflog[0-9.]*$\|^pfsync[0-9.]*$)`|
|{$NET.IF.IFOPERSTATUS.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`^.*$`|
|{$NET.IF.IFOPERSTATUS.NOT_MATCHES}|<p>Ignore notPresent(6).</p>|`^6$`|
|{$NET.IF.IFTYPE.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFTYPE.NOT_MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$SNMP.TIMEOUT}|<p>The time interval for SNMP availability trigger.</p>|`5m`|
|{$STATE.TABLE.UTIL.MAX}|<p>Threshold of state table utilization trigger in %.</p>|`90`|
|{$SOURCE.TRACKING.TABLE.UTIL.MAX}|<p>Threshold of source tracking table utilization trigger in %.</p>|`90`|

### Items

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|OPNsense: SNMP agent availability|<p>Availability of SNMP checks on the host. The value of this item corresponds to availability icons in the host list.</p><p>Possible value:</p><p>0 - not available</p><p>1 - available</p><p>2 - unknown</p>|Zabbix internal|zabbix[host,snmp,available]|
|OPNsense: Packet filter running status|<p>MIB: BEGEMOT-PF-MIB</p><p>True if packet filter is currently enabled.</p>|SNMP agent|opnsense.pf.status|
|OPNsense: States table current|<p>MIB: BEGEMOT-PF-MIB</p><p>Number of entries in the state table.</p>|SNMP agent|opnsense.state.table.count|
|OPNsense: States table limit|<p>MIB: BEGEMOT-PF-MIB</p><p>Maximum number of 'keep state' rules in the ruleset.</p>|SNMP agent|opnsense.state.table.limit|
|OPNsense: States table utilization in %|<p>Utilization of state table in %.</p>|Calculated|opnsense.state.table.pused|
|OPNsense: Source tracking table current|<p>MIB: BEGEMOT-PF-MIB</p><p>Number of entries in the source tracking table.</p>|SNMP agent|opnsense.source.tracking.table.count|
|OPNsense: Source tracking table limit|<p>MIB: BEGEMOT-PF-MIB</p><p>Maximum number of 'sticky-address' or 'source-track' rules in the ruleset.</p>|SNMP agent|opnsense.source.tracking.table.limit|
|OPNsense: Source tracking table utilization in %|<p>Utilization of source tracking table in %.</p>|Calculated|opnsense.source.tracking.table.pused|
|OPNsense: DHCP server status|<p>MIB: HOST-RESOURCES-MIB</p><p>The status of DHCP server process.</p>|SNMP agent|opnsense.dhcpd.status<p>**Preprocessing**</p><ul><li>Check for not supported value: <p>⛔️Custom on fail: Set value to: `0`</p></li></ul>|
|OPNsense: DNS server status|<p>MIB: HOST-RESOURCES-MIB</p><p>The status of DNS server process.</p>|SNMP agent|opnsense.dns.status<p>**Preprocessing**</p><ul><li>Check for not supported value: <p>⛔️Custom on fail: Set value to: `0`</p></li></ul>|
|OPNsense: Web server status|<p>MIB: HOST-RESOURCES-MIB</p><p>The status of lighttpd process.</p>|SNMP agent|opnsense.lighttpd.status<p>**Preprocessing**</p><ul><li>Check for not supported value: <p>⛔️Custom on fail: Set value to: `0`</p></li></ul>|
|OPNsense: Packets matched a filter rule|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.match<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Packets with bad offset|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.bad.offset<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Fragmented packets|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.fragment<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Short packets|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.short<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Normalized packets|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.normalize<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Packets dropped due to memory limitation|<p>MIB: BEGEMOT-PF-MIB</p><p>True if the packet was logged with the specified packet filter reason code. The known codes are: match, bad-offset, fragment, short, normalize, and memory.</p>|SNMP agent|opnsense.packets.mem.drop<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Firewall rules count|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of labeled filter rules on this system.</p>|SNMP agent|opnsense.rules.count|

### Triggers

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|OPNsense: No SNMP data collection|<p>SNMP is not available for polling. Please check device connectivity and SNMP settings.</p>|`max(/OPNsense by SNMP/zabbix[host,snmp,available],{$SNMP.TIMEOUT})=0`|Warning||
|OPNsense: Packet filter is not running|<p>Please check PF status.</p>|`last(/OPNsense by SNMP/opnsense.pf.status)<>1`|High||
|OPNsense: State table usage is high|<p>Please check the number of connections.</p>|`min(/OPNsense by SNMP/opnsense.state.table.pused,#3)>{$STATE.TABLE.UTIL.MAX}`|Warning||
|OPNsense: Source tracking table usage is high|<p>Please check the number of sticky connections.</p>|`min(/OPNsense by SNMP/opnsense.source.tracking.table.pused,#3)>{$SOURCE.TRACKING.TABLE.UTIL.MAX}`|Warning||
|OPNsense: DHCP server is not running|<p>Please check DHCP server settings.</p>|`last(/OPNsense by SNMP/opnsense.dhcpd.status)=0`|Average||
|OPNsense: DNS server is not running|<p>Please check DNS server settings.</p>|`last(/OPNsense by SNMP/opnsense.dns.status)=0`|Average||
|OPNsense: Web server is not running|<p>Please check lighttpd service status.</p>|`last(/OPNsense by SNMP/opnsense.lighttpd.status)=0`|Average||

### LLD rule Network interfaces discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|Network interfaces discovery|<p>Discovering interfaces from IF-MIB.</p>|SNMP agent|opnsense.net.if.discovery|

### Item prototypes for Network interfaces discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound packets discarded|<p>MIB: IF-MIB</p><p>The number of inbound packets which were chosen to be discarded</p><p>even though no errors had been detected to prevent their being deliverable to a higher-layer protocol.</p><p>One possible reason for discarding such a packet could be to free up buffer space.</p><p>Discontinuities in the value of this counter can occur at re-initialization of the management system,</p><p>and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in.discards[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound packets with errors|<p>MIB: IF-MIB</p><p>For packet-oriented interfaces, the number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.  For character-oriented or fixed-length interfaces, the number of inbound transmission units that contained errors preventing them from being deliverable to a higher-layer protocol. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in.errors[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Bits received|<p>MIB: IF-MIB</p><p>The total number of octets received on the interface, including framing characters. This object is a 64-bit version of ifInOctets. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound packets discarded|<p>MIB: IF-MIB</p><p>The number of outbound packets which were chosen to be discarded</p><p>even though no errors had been detected to prevent their being deliverable to a higher-layer protocol.</p><p>One possible reason for discarding such a packet could be to free up buffer space.</p><p>Discontinuities in the value of this counter can occur at re-initialization of the management system,</p><p>and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out.discards[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound packets with errors|<p>MIB: IF-MIB</p><p>For packet-oriented interfaces, the number of outbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.  For character-oriented or fixed-length interfaces, the number of outbound transmission units that contained errors preventing them from being deliverable to a higher-layer protocol. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out.errors[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Bits sent|<p>MIB: IF-MIB</p><p>The total number of octets transmitted out of the interface, including framing characters. This object is a 64-bit version of ifOutOctets.Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second: </li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Speed|<p>MIB: IF-MIB</p><p>An estimate of the interface's current bandwidth in units of 1,000,000 bits per second. If this object reports a value of `n' then the speed of the interface is somewhere in the range of `n-500,000' to`n+499,999'.  For interfaces which do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth. For a sub-layer which has no concept of bandwidth, this object should be zero.</p>|SNMP agent|net.if.speed[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1000000`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Operational status|<p>MIB: IF-MIB</p><p>The current operational state of the interface.</p><p>- The testing(3) state indicates that no operational packet scan be passed</p><p>- If ifAdminStatus is down(2) then ifOperStatus should be down(2)</p><p>- If ifAdminStatus is changed to up(1) then ifOperStatus should change to up(1) if the interface is ready to transmit and receive network traffic</p><p>- It should change todormant(5) if the interface is waiting for external actions (such as a serial line waiting for an incoming connection)</p><p>- It should remain in the down(2) state if and only if there is a fault that prevents it from going to the up(1) state</p><p>- It should remain in the notPresent(6) state if the interface has missing(typically, hardware) components.</p>|SNMP agent|net.if.status[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Interface type|<p>MIB: IF-MIB</p><p>The type of interface.</p><p>Additional values for ifType are assigned by the Internet Assigned Numbers Authority (IANA),</p><p>through updating the syntax of the IANAifType textual convention.</p>|SNMP agent|net.if.type[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Rules references count|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of rules referencing this interface.</p>|SNMP agent|net.if.rules.refs[{#SNMPINDEX}]|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv4 traffic passed|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv4 bits per second passed coming in on this interface.</p>|SNMP agent|net.if.in.pass.v4.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv4 traffic blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv4 bits per second blocked coming in on this interface.</p>|SNMP agent|net.if.in.block.v4.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv4 traffic passed|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv4 bits per second passed going out on this interface.</p>|SNMP agent|net.if.out.pass.v4.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv4 traffic blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv4 bits per second blocked going out on this interface.</p>|SNMP agent|net.if.out.block.v4.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv4 packets passed|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv4 packets passed coming in on this interface.</p>|SNMP agent|net.if.in.pass.v4.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv4 packets blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv4 packets blocked coming in on this interface.</p>|SNMP agent|net.if.in.block.v4.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv4 packets passed|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv4 packets passed going out on this interface.</p>|SNMP agent|net.if.out.pass.v4.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv4 packets blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv4 packets blocked going out on this interface.</p>|SNMP agent|net.if.out.block.v4.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv6 traffic passed|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv6 bits per second passed coming in on this interface.</p>|SNMP agent|net.if.in.pass.v6.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv6 traffic blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv6 bits per second blocked coming in on this interface.</p>|SNMP agent|net.if.in.block.v6.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv6 traffic passed|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv6 bits per second passed going out on this interface.</p>|SNMP agent|net.if.out.pass.v6.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv6 traffic blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>IPv6 bits per second blocked going out on this interface.</p>|SNMP agent|net.if.out.block.v6.bps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv6 packets passed|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv6 packets passed coming in on this interface.</p>|SNMP agent|net.if.in.pass.v6.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Inbound IPv6 packets blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv6 packets blocked coming in on this interface.</p>|SNMP agent|net.if.in.block.v6.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv6 packets passed|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv6 packets passed going out on this interface.</p>|SNMP agent|net.if.out.pass.v6.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Outbound IPv6 packets blocked|<p>MIB: BEGEMOT-PF-MIB</p><p>The number of IPv6 packets blocked going out on this interface.</p>|SNMP agent|net.if.out.block.v6.pps[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|

### Trigger prototypes for Network interfaces discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: High input error rate|<p>It recovers when it is below 80% of the `{$IF.ERRORS.WARN:"{#IFNAME}"}` threshold.</p>|`min(/OPNsense by SNMP/net.if.in.errors[{#SNMPINDEX}],5m)>{$IF.ERRORS.WARN:"{#IFNAME}"}`|Warning|**Depends on**:<br><ul><li>OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: High inbound bandwidth usage|<p>The utilization of the network interface is close to its estimated maximum bandwidth.</p>|`(avg(/OPNsense by SNMP/net.if.in[{#SNMPINDEX}],15m)>({$IF.UTIL.MAX:"{#IFNAME}"}/100)*last(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])) and last(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])>0`|Warning|**Depends on**:<br><ul><li>OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: High output error rate|<p>It recovers when it is below 80% of the `{$IF.ERRORS.WARN:"{#IFNAME}"}` threshold.</p>|`min(/OPNsense by SNMP/net.if.out.errors[{#SNMPINDEX}],5m)>{$IF.ERRORS.WARN:"{#IFNAME}"}`|Warning|**Depends on**:<br><ul><li>OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: High outbound bandwidth usage|<p>The utilization of the network interface is close to its estimated maximum bandwidth.</p>|`(avg(/OPNsense by SNMP/net.if.out[{#SNMPINDEX}],15m)>({$IF.UTIL.MAX:"{#IFNAME}"}/100)*last(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])) and last(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])>0`|Warning|**Depends on**:<br><ul><li>OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Ethernet has changed to lower speed than it was before|<p>This Ethernet connection has transitioned down from its known maximum speed. This might be a sign of autonegotiation issues. Acknowledge to close the problem manually.</p>|`change(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])<0 and last(/OPNsense by SNMP/net.if.speed[{#SNMPINDEX}])>0 and ( last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=6 or last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=7 or last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=11 or last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=62 or last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=69 or last(/OPNsense by SNMP/net.if.type[{#SNMPINDEX}])=117 ) and (last(/OPNsense by SNMP/net.if.status[{#SNMPINDEX}])<>2)`|Info|**Depends on**:<br><ul><li>OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|OPNsense: Interface [{#IFNAME}({#IFALIAS})]: Link down|<p>This trigger expression works as follows:<br>1. It can be triggered if the operations status is down.<br>2. `{$IFCONTROL:"{#IFNAME}"}=1` - a user can redefine context macro to value - 0. That marks this interface as not important. No new trigger will be fired if this interface is down.</p>|`{$IFCONTROL:"{#IFNAME}"}=1 and (last(/OPNsense by SNMP/net.if.status[{#SNMPINDEX}])=2)`|Average||

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