Avocent Cyclades ACS Service Manual download pdf (Page 28)

20 Cyclades ACS 5000 Advanced Console Server Command Reference Guide

cli> config network snmp v3 add username john password john1234 oid .1

permission ro

2. Activate and save your configuration.

Hosts

To configure hosts:

1. Add a host name with IP address.

cli> config network hosttable add hostip <n.n.n.n> name [hostname]

You may repeat this step as many times as necessary.

2. Activate and save your configuration.

TCP keepalive

The objective of this feature is to allow the console server to recognize when the socket client, SSH

or Telnet goes down without closing the connection properly. The TCP engine of the console server

sends a TCP keepalive message (ACK) to the client. If the maximum retry number is reached

without an answer from the client, the connection is closed.

To configure TCP keepalive:

1. Configure the pool interval in milliseconds.

cli> config physicalports all other tcpkeepalive <number>

2. Activate and save your configuration.

Firewall Configuration (IP Filtering)

IP filtering consists of blocking the passage of IP packets based on rules defined in the

characteristics of the packets, such as the contents of the IP header, the input/output interface or the

protocol. This feature is used mainly in firewall applications, which filter the packets that could

crack the network system or generate unnecessary traffic.

Network Address Translation (NAT) allows the IP packets to be translated from local network to

global network and vice-versa. This feature is particularly useful when there is demand for more IP

addresses in the local network than available as global IP addresses. In the console server, this

feature is used mainly for clustering (one master console server works as the interface between the

global network and the slave console servers).

NOTE: The NAT table is not used with IPv6.

The console server uses the Linux utility iptables to set up, maintain and inspect both the filter and

the NAT tables of IP packet rules in the Linux kernel. Besides filtering or translating packets, the

iptables utility is able to count the packets which match a rule and to create logs for specific rules.

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Avocent Cyclades ACS Service Manual Page 28