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Firebox T40 and Verizon Internet issue
Firebox T40 is being used as the main router. Comcast (wired) Internet connection is main Internet connection, and trying to add Veriozn (wireless) Internet as a secondary (failover) Internet connection.
When Comcast connection is used, there is no problem. However, when Verizon connection is used, the POS system, which relies on Internet connection, stops working, and some websites cannot be accessed while others can be.
What I noticed is that, if http, https proxies are bypasses by creating firewall rule in Firebox T40, the problem disappears.
Has anyone had an issue like this and figured out why it is happening?
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How is the Verizon wireless Internet connection provided?
4G USB device?
Could be a MTU issue.
Also, could be a DNS resolution issue.
Some ISPs DNS servers will not respond to traffic from some other ISP.
If all of your DNS traffic is going to Comcast DNS servers when connected to the Verizon link, this may be the issue.
If so, try using a Google DNS server, such as 8.8.8.8 or 8.8.4.4
Hello Bruce
I am attaching the picture of the Verizon router.
I think it is not DNS issue since http, https proxies have nothing to do with DNS. As I said, if direct http or https connections are allowed without having to go through the proxies, there is no problem.
Firebox T40 and the Verizon router are connected to each other using an Ethernet cable.
I'm unable to read the model number - pic is too blurry to magnify.
So this router is connecting to Verizon using a wireless connection ???
Or is it Fios? or ??
If the MTU of the Verizon connection is less than 1500, there have been cases where some web sites don't work without changing the firewall external interface MTU (Advanced tab) to match the ISP MTU.
There are the Global Settings > Networking > TCP Settings > TCP MTU Probing options.
And TCP maximum segment size control limit which could be tweaked.
Nothing in Traffic Monitor to help understand this?
What Fireware version is on your T40?
I think this is the model: https://www.verizon.com/business/support/equipment-devices-services/routers/verizon-internet-gateway-business-fsno21va/?cmp=MAIL_5GSetupBizInternetGateway_20220104&utm_campaign=5G Setup - Business Internet Gateway&utm_content=link&utm_medium=Direct Mail&utm_source=MyVerizon
The manual of this Verizon router is at https://www.verizon.com/business/resources/userguides/verizon-internet-gateway-for-business-ug-v7-0906.pdf
Why would you think it could be MTU issue? Whether going through the proxies or not, the traffic is going through Firebox T40. The only config that made differece was firewall rule which allowed bypassing of http, https proxies.
I will attempt to access traffic monitor when i can. But, when I looked at it breifly, I don't think I saw anything standing out.
It turned out that the problem was on Verizon side. Verizon released two quick firmware updates, and instllaing the most recent version of the firmeware solved the problem.