Category Archives: Computer Networking

This category contains any networking related materials.

Using Dynamic DNS server with HE.net

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For those who have a second level domain and are using or would like to use the Dynamic DNS (refer to DDNS below) service, they should often find that the free DDNS service does not cover enough number of hostnames (A records). The only way out was to pay extra for additional hostnames or to build their own DNS servers to support DDNS services.
I am having the same problem today as well. I have more than 5 devices that needs to be able to remote access to when I m on the road, and the DDNS providers requires me to pay extra for additional supporting devices. In my low budget case, I have found an alternative way to solve this problem, which is to go for the free DNS service from Hurricane Electronic. Continue reading →

Learning OSPF with one Juniper SRX100 (basic)

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One of the beauties of Jumiper SRX is it has a heritage function from ScreenOS called “virtual router”. Unlike ScreenOS, Junos has the ability link virtual routers up with logical interfaces (lt-0/0/0). With these 2 features, Virtual routers could have their own route tables, could simulate several routers within a single box of SRX, and could run routing protocols between them. (I have tried with Cisco VRF, but it doesn’t work as expected.)
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What is DDNS?

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Dynamic Domain Name Service (DDNS) is a service to associates a domain name to a dynamic IP address assigned by ISP that changes over time.
Users who subscribed internet services with dynamic IP addresses could use DDNS to provide a path to their resources, such as web services, Emil services, or file sharing services with a easily memorize domain name to access with.
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DDNS at ScreenOS

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Dynamic Domain Name Service (DDNS) is not anything new from the last decade. It associates a domain name to an IP address that changes over time. Users could access to the resources behind a dynamic IP address assigned CPE with an easily memorized domain name instead.
In this post, I ll post the procedure of setting up DDNS at ScreenOS using NO-IP DDNS service with SSL enabled in GUI. One of ScreenOS’ beauties is the GUI management.
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