Unraid can't visit internet minutes after booting

[marco_yang]

My unraid server was able to visit internet (docker provided DDNS service works fine, also App store can be visited) but a few minutes after booting unraid can't visit internet (my DDNS docker reports visit refused and App store can't be accessed). I can still use internal IP address 192.168.4.112 visit unraid but it just can't visit internet.

 

Maybe this is because I just switched my router to Openwrt and some of my network configuration haven't be correctly changed? But wierdly my Synology server under same network can constantly using DDNS service as well as download from synology package center.

 

Does anyone have similar trouble before?

 

 

 

northernlight3s-diagnostics-20230413-0149.zip

[marco_yang]

UNRAID Pro 6.12.0-RC2

[marco_yang]

maybe I need to reinstall UNRAID to solve this issue

[ljm42]

It looks like your server is configured for Jumbo frames, revert that back to normal. See https://forums.unraid.net/topic/120220-fix-common-problems-more-information/page/2/#comment-1167702

 

 

It also looks like the server has four NICs, but eth0 is not connected. Unraid works best when eth0 is your main NIC, you can either move the network cable around until you find eth0 or you can go to Settings -> Network Settings Interface Rules and adjust until the connected NIC is eth0. See https://forums.unraid.net/topic/120220-fix-common-problems-more-information/page/2/#comment-1170361

 

Once the network is back, I highly recommend you install the Fix Common Problems plugin as it will automatically alert you to this sort of thing.

 

[marco_yang]

7 hours ago, ljm42 said:

It looks like your server is configured for Jumbo frames, revert that back to normal

Thank you! It works!

For those of you who struggle in the same issue, set MTU back to 1500 and reboot.