everything works through gre at the beginning of the ipsec, then gre and then ospf, it was possible to do without this change, but only ospf would not work, everything else worked

For some reason, there is no protocol in the choice in policy 47

Yes, it's already in production.

Hello wiseroute

Settings
/ip ipsec policy
The default is 255I put up only gre protocol
After that everything worked

Of course, you need to change on both sides

Everything worked out, it started on my scheme of work, in the IPsec policy I put 47 in place 255, everything worked, and from 7 to 7 version of Ros and from 6 to 7 RoS, everything now works at any MTU value if it is set at both ends.

Hello
Yes, with a physical interface, everything also works for me, but in my configuration it doesn’t.
But this scheme works on Router OS version 6

thanks wiseroute I set the value of MTU 1476, but the result is negative. I also chose the broadcast for the gre interface. It seems to me that the problem is not in the mtu values and the ospf settings, but in the firewall itself. If it's not difficult, can you export your settings to gre, ospf a...

Yes, I turned it off so that errors were not written to the device log.
The settings should have been done already from hopelessness, I tried different variations
I post the modified version, but the result is negative

CHR5009

Hello mducharme
I added rules on both routers
add action=accept chain=input in-interface=gre-justhost log-prefix=fi-ospf protocol=ospf src-address=172.16.0.0/12.
I tried to disable all rules in all chains, but the result is negative

Thanks for the answer I registered metrics for routes for both routers, pings fly and traffic too. I left the MTU value of 1350, the tunnel stops working above. I set the fragmentation and the MTU value to 1500, the tunnel works, but the OSPF does not want to turn on. In vain, apparently, I bought d...

MTU的价值观,我改变了他们desperation It defaults to 1350. I set up the fire wall rule right away, turned on logging and noticed one peculiarity, for some reason traffic goes through the external interface, although it should not go there, it should go inside the protocol gre f...

mtu interfaces gre

Log with CHR 19:57:57 route,ospf,info default { version: 2 router-id: 10.255.254.1 } backbone { 0.0.0.0 } interface { broadcast 192.168.254.1%bridge-local } neighbor election 19:57:57 route,ospf,info log-ospf: default { version: 2 router-id: 10.255.254.1 } backbone { 0.0.0.0 } interface { broadcast ...

起初,我组up the IP sec, after that I already start the GRE tunnel with addresses that I don’t use inside the network. After that, I already run ospf. I did your recommendations but nothing helps, it does not work even with version 7 on both routers. Created a new clean install between...

Today I changed my 4011 to 5009, all versions on Ros7

Hello
In production condition.
I did a loopback with and without it, I tried it still does not work, neither 7 with version 7 nor 7 with 6.

I had such a problem, I clicked upgrade and chose to buy without money and everything went well

Hi all I have several routers, RB4011 and Hap AC3, with a GRE tunnel built between them. In my configuration, the OSPF protocol does not work with ROS V6 and ROS V7, and this configuration does not work when I have ROS V7 and ROS V7. But this configuration works absolutely fine between ROS V6 and RO...

Thank you so much

Hello everyone
We bought a CRS354-48G-4S+2Q+ device today, for some reason it has some 49 port, what is this port, a 48-port switch all the same?

Thank you for not breaking the IKE 2. On the stable version, dynamic connections with LTE, without real IP addresses disappear, I don't know how to solve.