User manual

FAQ - Frequently

asked questions

Q: No network connection after changing the network address

A: After changing the network address of the AnaGate device via web interface

the device is not longer reachable. The used internet browser displays only an

empty web page, additional error messages are not available.

Please check if your anti-virus software has blocked the new network address.

After changing the network address you are redirected to the new network

address in the browser. Such activity is suspicious for some anti-virus software

so they block the new web page, sometimes even without notification of the

user.

Q: Connection problems using multiple devices

A: If multiple devices with identical IP addresses are used in a local area network

at the same time the connections to the devices are not stable. Because of this

behaviour it is necessary to use different IP addresses.

This problem can also occur if devices with identical IP addresses are used not

concurrently but within short intervals. For example this can arise if some new

devices which have the default IP address 192.168.1.254 are configured from

a single PC.

The Address Resolution Protocol (ARP) is used in IPv4 networks to

determine the MAC address of a given IP address. The necessary information

is cached in the ARP table. If there is a wrong entry in the ARP table or even

an entry which is not up-to-date it is not possible to communicate with the

corresponding host.

An entry in the ARP table is deleted if it is not used any more after a short period

time. The time interval used depends on the operating system. On a current

Linux distribution an unused entry is discarded after about 5 minutes. The ARP

cache can be displayed and manipulated with the arp on Windows and Linux.

C:\>arp -a

Schnittstelle: 10.1.2.50 --- 0x2

Internetadresse Physikal. Adresse Typ

192.168.1.254 00-50-c2-3c-b0-df dynamisch

The command arp -d can be used to empty the ARP Cache.

Note

Possibly the ARP cache of the PC has to be deleted if the IP address

of a device is changed.

Q: Using a firewall

A: When working with a firewall a TCP port has to be opened for communication

with the AnaGate device:

Device Port number

AnaGate I2C 5000