WebEx Conference too laggy, how to optimize network DNS settings??? Solution//Global IPLC service pr

WebEx Conference too laggy, how to optimize network DNS settings??? Solution//Global IPLC service provider of Shigeng Communication

一、The video frames freeze on the confused expressions of colleagues, and the audio is intermittent as if traveling through a time and space tunnel. You know this is not just a technical malfunction, but precious meeting time is being lost.

At 10 o'clock this morning, the global product launch rehearsal hosted by Marketing Director Li Wei once again encountered technical difficulties. The presentation by the Shanghai team turned into pixelated mosaics on the screens of colleagues in New York, with critical data lost during transmission. Fifteen minutes of the half-hour meeting were spent on repeated confirmations of "Can you hear me?" and "The screen is stuck.

This is not the first time it has happened. According to IT department statistics, over 40% of cross-border WebEx conferences have experienced varying degrees of connectivity issues, with DNS resolution latency being one of the hidden killers.

1. Tracing network lag and how DNS affects WebEx experience

WebEx conference lag typically manifests as video freezing, audio interruptions, screen sharing delays, and unstable connections. Many people may initially suspect that bandwidth is insufficient, but in many enterprise environments, the real problem often lies at a more fundamental level of the network - DNS resolution.

DNS (Domain Name System) is equivalent to the "phonebook" of the Internet, which is responsible for translating human readable domain names (such as

webex.com

）Convert to a computer recognizable IP address. When you join a WebEx meeting, the client needs to resolve multiple domain names to connect to different servers.

If the DNS server responds slowly or unreliability, even with sufficient bandwidth, WebEx clients may take seconds or even longer to locate and connect to the server, resulting in prolonged black screen at the beginning of the meeting or sudden lag during the meeting due to domain name re resolution.

The DNS servers used by enterprises by default are often automatically allocated by operators, and these servers sometimes have high loads, remote geographical locations, or insufficient optimization for resolving international domain names. Especially for services like WebEx that use a global content delivery network (CDN), choosing the wrong DNS may result in connecting to server nodes that are geographically distant and have high loads.

2. DNS optimization strategy, four step precise tuning solution

Optimizing DNS settings does not require complex network expertise. Following the following four steps can usually significantly improve the connection quality of WebEx in a short period of time.

Step 1: Choose a high-performance public DNS server

Replacing the default DNS is the most direct way to improve resolution speed. The following are widely tested and recommended public DNS services, specifically optimized for video conferencing applications:

Tencent DNSPod Public DNS:

119.29.29.29

and

182.254.116.116

Advantages: Multiple domestic nodes, fast response speed, and good resolution for both domestic and foreign domain names

Suitable for scenarios where the main conference participants are in China

Alibaba Cloud Public DNS:

223.5.5.5

and

223.6.6.6

Advantages: Stable and reliable, with strong resistance to attacks

Suitable for: Enterprise environments that pursue stability

114DNS：

114.114.114.114

and

114.114.115.115

Advantage: Domestic veteran public DNS with wide coverage

Suitable: as an alternative solution

Step 2: Configure DNS settings for personal devices

The methods for configuring DNS vary slightly among different operating systems:

Windows system:

Open Control Panel>Network and Internet>Network and Sharing Center

Click on the currently connected network (such as "Ethernet" or "WLAN")

Select "Properties">"Internet Protocol Version 4 (TCP/IPv4)">"Properties"

Select 'Use the following DNS server address' and enter the preferred and backup DNS addresses

Check 'Verify settings upon exit' to ensure correct configuration

MacOS system:

Open "System Preferences">"Network"

Select the current network connection>"Advanced">"DNS"

Add a new DNS address to the DNS server list (existing addresses can be removed)

Click 'OK' to save the settings

Step 3: Refresh local DNS cache

After changing the DNS, it is necessary to clear the old DNS cache of the system for the new settings to take effect immediately:

Windows: Run the command prompt as an administrator and enter

ipconfig /flushdns

MacOS: Open the terminal and enter

sudo killall -HUP mDNSResponder

Step 4: Verify the effectiveness of DNS optimization

After the configuration is completed, the optimization effect can be verified through the following methods:

Test using nslookup: Enter in the command prompt or terminal

nslookup webex.com

Check the resolution speed and returned IP address

Using online speed measurement tools: Access such as

www.dnsperf.com

Wait for the website and test the response speed of different DNS

Practical experience of WebEx: Join a testing meeting to observe the connection establishment time and stability during the meeting

3. Enterprise level optimization plan, large-scale deployment strategy

For enterprise network environments, in addition to configuring terminal devices, more comprehensive optimization measures can also be taken:

Router level DNS settings: Configure global DNS on the enterprise's router or firewall, so that all devices connected through the network automatically use optimized DNS, avoiding the hassle of configuring one by one.

Intelligent DNS Resolution Service: Consider deploying enterprise level intelligent DNS services that can intelligently resolve WebEx requests to the optimal server node based on factors such as user geographic location and network conditions.

Local DNS Cache Server: Deploying a local DNS cache server (such as dnsmasq or Windows Server DNS role) in a large enterprise network can significantly reduce reliance on external DNS queries and improve overall resolution speed.

Diversion resolution strategy: Configure DNS diversion to redirect queries for international domain names (such as WebEx related domain names) to optimized international routes, while using domestic DNS for domestic domain names, balancing speed and compliance.

4. Comprehensive network optimization to enhance conference experience in all aspects

Although DNS optimization is important, it is only one aspect of network optimization. To comprehensively improve the WebEx experience, attention should also be paid to the following aspects:

Bandwidth management and QoS strategy: Ensure sufficient bandwidth guarantee for video conferencing traffic. Configure quality of service (QoS) policies in enterprise routers to prioritize handling UDP traffic for WebEx (typically using port range: 9000-9999).

Wired connection priority: Use wired Ethernet connections instead of Wi Fi as much as possible, especially for important conference hosts and speakers. Wired connections can provide more stable bandwidth and lower latency.

Background traffic control: During the conference, restrict or suspend high bandwidth consuming activities such as downloading large files, cloud synchronization, and streaming media playback to ensure that network resources are prioritized for WebEx.

Dedicated conference network: For enterprises that frequently hold important cross-border meetings, it may be considered to establish a dedicated conference network or VLAN to isolate other business traffic and provide a pure network environment.

Regular Network Health Check: Use tools such as Ping and Traceroute to regularly check the network path quality of WebEx servers, and promptly identify and resolve issues with intermediate network nodes.

After implementing a DNS optimization solution, a multinational technology company reduced the average WebEx conference connection time of its global team by 68% and unexpected interruptions during meetings by 82%.

When the picture is smooth, the sound is clear, and collaboration is seamless, technology becomes invisible, allowing people to focus on the content of the meeting itself - that is exactly what efficient collaboration should look like.

二、Shigeng Communication Global Office Network Products:

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Features of Global Application Network Products for Multinational Enterprises:

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Product tariff: