Day 16 - SNMP、Banner Grabbing 與Firewall Rules

使用SNMP 協定若需穿過防火牆來傳送查詢封包時，則防火牆上必須允許下列哪一種封包通過防火牆： (A) TCP 目的port=22 (B) UDP 目的port=161 (C) UDP 目的port=138

通常會顯示版號或是其他系統相關的資訊，尷尬點就是這有可能會將OS 的版本訊息向外揭露，一但攻擊者發現到你的系統還在使用有安全性漏洞的舊版本OS，就有可能遭受攻擊。

SNMP uses both port 161 and port 162 for sending commands and messages. ... While SNMP over TCP port is possible, SNMP ... firewall to receive alarms on your master ...

These steps explain how to check if the Operating System (OS) of the Nagios server has firewall rules enabled to allow inbound SNMP Trap UDP port 162 traffic.

2008年12月20日 — Of course you require port 80 (or 443) opened to your Orion server from the Web clients access the Orion web page. You also must open UDP 514 ...

2007年3月31日 — Hi, This is the first time I'm using snmpv3. I have a firewall. Understand that normal snmpv1/2 uses TCP and UDP ports 161 and 162.

The SNMP Manager sends requests to Agent's UDP Port 161 and receive responses on the same source port that the request was sent. Each of the requests sends one ...

2023年10月20日 — To make your SNMP implementation as secure as possible, you should block port 161 in your firewall. If you absolutely need the port open, you ...

2023年5月22日 — It is a UDP port, with the default port number being 161 for SNMP agents and 162 for SNMP managers receiving traps. How does an SNMP port work?

ManageEngine's Suite of Free Tools includes a SNMP MIB Browser which helps to Load/unload MIBs and fetch MIB data of SNMP(v1, v2c, v3) agents. SNMP MIB Browser ...