Sonicwall Access Point Bad Download Speed but Good Upload
How tin can I troubleshoot tiresome Internet speed in SonicWall firewall in two steps?
03/26/2020 
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Description
A common problem we come across "Net speed is so ho-hum... crawling.... Nosotros take a 100 meg upwardly and 100 1000000 downwards speed from Isp. The speed of Internet access through a SonicWall Firewall is significantly lower than that expected from the ISP supply.
The purpose of this commodity is to discuss mutual configuration issues. Links to articles for further reading are provided towards the end.
Cause
While slow Cyberspace access speed through a firewall can be caused by a number of issues, it is worth checking a few configuration tweaks that accept helped resolve the issue in several occasions.
Resolution
- Bank check lInk speed WAN interface (e.thousand., X1) | Avant-garde:
TIP: Fig. 1. Optimizing the Link Speed and MTU on the Advanced tab of the WAN interface where the defaults neglect to establish a compatible Internet access provider connection. - Check the MTU.
A mismatch in the maximum transmission unit (MTU) between the firewall and the ISP device can impact the bandwidth. In one of my cases, just by optimizing the MTU we were able to regain the bandwidth (5% to ninety%). An optimal condition for the exam would be to connect a computer directly to the firewall (Fig.2). This is to rule out uncertainties almost latency due to a network.
TIP: Fig.two. Checking MTU on a straight connected computer is my preferred manner to minimize uncertainties about latency involved in a complex network.A typical MTU optimization test involves doing a ping with the options of-f (don't fragment) and-l (size) every bit summarized in Fig. 3. I kickoff with an MTU of 1500 and find out a value where there is a successful ping. And so I add 28 $.25 to derive an MTU value I would be using on the WAN interface.
TIP: Ping Test on a Windows Computer direct connected to the Firewall. I would add 28 to the concluding MTU value that resulted in a successful ping. - Check the DNS settings of the Computer where you are testing.
On a few occasions, although you see a reasonable bandwidth, web pages take long to initially load. Showtime doubtable was the DNS. When you blazon world wide web.abc.com on a browser, the outset thing we do is aDNS proper noun resolution to get the IP. In Fig. 4, the host is trying to resolve names by accessing local DNS- one local and another across a VPN tunnel. This is a security measure. Even so, if the local DNS is having an issue (overwhelmed, network latency...), it will slow the DNS proper noun resolution. Just by using a public DNS that is readily bachelor, we were able to overcome the slow page load issue.
TIP: Fig. 4. DNS assault the Network Configuration can ofttimes create slowness in initial lading of web pages on a browser. To rule out latency due to proper name resolution consider using a public DNS that has a fast admission.
Farther Reading:
Following is a compilation of related manufactures for further reading. They include involved troubleshooting methods and scenarios.
Troubleshooting Network Throughput, Latency, and Bandwidth Issues with a SonicWall UTM
Optimize MTU for VPN
Minimum Bandwidth, Latency and Keep Live for a Tunnel Client Connection
To troubleshoot speed or throughput issues with the SonicWall
How to apply iPerf to measure Throughput on a SonicWall device
Related Manufactures
- Best practices for ambassador managing SonicWall Firewall Appliances
- How to configure failover when there are ii or more WAN Interfaces?
- How tin I put the SonicWall into condom mode?
Categories
- Firewalls > NSa Series > Networking
- Firewalls > TZ Series > Networking
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Source: https://www.sonicwall.com/support/knowledge-base/how-can-i-troubleshoot-slow-internet-speed-in-sonicwall-firewall-in-two-steps/171025223714035/
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