SNTP client cannot synchronize time, error server-ip-mismatch.(

SNTP client cannot synchronize time, error server-ip-mismatch.(

This error is on router? Or You are using router as NTP server and this error is on clients?

Are you sure that ISP is not doing something with NTP packets? It is very popular complaint at support - that NTP does not work, but almost always simply ISP is, for example, dropping such packets.

Check port 123 udp is not closed by your isp. I have the same problem last week from ISP.

Sent from my C6833 using Tapatalk

Check port 123 udp is not closed by your isp. I have the same problem last week from ISP.

Sent from my C6833 using Tapatalk

hi, how I can check?.
I did some research, (even though I dont beleive, that problem on ISP side) they said use telnet to ISP to specific port, but seems it does not work well. Unable to test even regular SMTP , POP ports.
Any other solution?

Did you try the NTP package?

I had this problem too. In my case I've just added more servers and one of them finally synchronized.
I've noticed that the ones added with ip don't always work, but between all of them you can get one to sync.

/system ntp client
set enabled=yes primary-ntp=98.175.203.200 secondary-ntp=66.219.116.140 \
server-dns-names="roc.nipne.ro,ntp.zyx.ro"

At first I also thought it was the isp blocking, turns out something isn't quite right with mikrotik or with some ntp servers.

I had this problem too. In my case I've just added more servers and one of them finally synchronized.
I've noticed that the ones added with ip don't always work, but between all of them you can get one to sync.

/system ntp client
set enabled=yes primary-ntp=98.175.203.200 secondary-ntp=66.219.116.140 \
server-dns-names="roc.nipne.ro,ntp.zyx.ro"

At first I also thought it was the isp blocking, turns out something isn't quite right with mikrotik or with some ntp servers.

thanks let me try that one

Server ip mismatch
In routed network router can have multiple interfaces and ip addresses and NTP server running on such router cananswer on different ip address then it received request. Then source NAT should be configured to solve this kind of problem which can result in
Bad packet reason = server-ip-mismatch
on client side.
/ip firewall nat add action=src-nat chain=srcnat comment="NTP" disabled=no \protocol=udp src-port=123 to-addresses=192.168.0.1
Where 192.168.0.1 is desired NTP server address. But this rule apply source NAT to all traffic going through soevery other NTP server traffic will be SNATed to one address too. Then this rule can be more closely specified withsrc-address parameter configured to all other ip address which router have on other interfaces. Then if router havethree addresses then two SNAT rules should be added like:
/ip firewall nat add action=src-nat chain=srcnat src-address="192.168.0.2" \comment="NTP interface ether2" disabled=no protocol=udp src-port=123 to-addresses=192.168.0.1/ip firewall nat add action=src-nat chain=srcnat src-address="192.168.0.3" \comment="NTP interface ether3" disabled=no protocol=udp src-port=123 to-addresses=192.168.0.1

Did you get it working?
If you need help with NAT config just drop a line.