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Why won't my X3 Interface Work?

NerdBNerdB Newbie ✭
edited August 2021 in Water Cooler

Hi There,

I'm fairly unexperienced with Sonicwall firewalls. Yes, I've RTFM'd manual. I'm using a TZ300.

What has been working for years is I have X0 as inside LAN, X1 as outside, X2 and WLAN, and X3 and X4 were unused. I went last week and configured a new network on X3 and it doesn't work! I don't know what i did wrong. I created a DHCP scope for that interface as well and it doesn't work. Obviously if X3 is down DHCP won't work. I've tried directly connecting to X3 with my laptop and still won't ping. I've tried use a switch in between my laptop and X3 and it also doesn't work. What am I missing?

I appreciate any suggestions or hints. I just purchased 3 more TZ300s so I need to figure this out ASAP.

Please see screenshots for current status.

Category: Water Cooler


  • Options
    LarryLarry All-Knowing Sage ✭✭✭✭

    Rough guess - your DHCP range ( - is inconsistent with the subnet ( that you've provided.

    Try making the range - and see if it floats.

  • Options
    NerdBNerdB Newbie ✭
    Hi Larry,
    Thanks for the suggestion. I also tried and that wasn't pingable either.
    I've tried with no DHCP scope in there and cannot be pinged. I feel like there is a setting that allows traffic through? Maybe, maybe not? I saw that when I created the X3 IP, SonicWall added a bunch fw rules and access to it by default, so that doesn't seem to be it.
    I should be able give a device and directly connect it and ping
    Any ideas?
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    NerdBNerdB Newbie ✭

    Ok experts, I still need help, but I think I discovered something about the SonicWall. It appears that there is a config for how X0-X4 behave. I found something in the "Quick Configuration" Guide for 6.5.

    It says there is an initial ports assignment that must be done related to PortShield. I'm not sure how that relates. However, my simple goal is to have each X0-X4 be a different network. X1 is always outside, X2 is set for WLAN, so that leaves X3 and X4. I need to know which settings to use so that each are their own subnet network. I have a feeling my new network (or /24) didn't work because X3 is somehow expecting to connect to the X1 gateway or something like that. My expectation in configuring the X3 interface is that X3 becomes a default route and gateway for the /24) network.

    Any ideas based on this information? Here is a screenshot(I apologize, it appears the screenshots only show at the top.


    ...or maybe they don't alway show at the top.

  • Options

    Hi @NERDB,

    You can go with first radio option. This shouldn't be an issue.

    When you connected a PC directly to the Firewall's X3 interface and tried pinging the interface IP from the PC, were you able to ensure if PING management was enabled on the interface?

    I see link status as 1 Gbps full duplex and this means the physical link works with the X3 port also functions.


    Saravanan V

    Technical Support Advisor - Premier Services

    Professional Services

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