3 -> 2.9 downgrade bug: firewall filter

RouterOS General
1

Hello, there is another bug in routeros when downgrading from 3.0.xx to 2.9.xx:

when I had (in 3.0) last rule in firewall

chain=forward action=drop dst-port=135-139 protocol=udp

after downgrade it’s

chain=forward action=drop protocol=udp

-it simply clears port numbers (it happens only with last rule in firewall filters). last “tested” router had 3.0beta10 (I’m not sure, if it happens when downgrading from 3.0rc9 too)

2

Because in 2.9 you are unable to specify port ranges like 1-n.

3

mrz can you cite your source? I have a 2.9 box where I have rules exactly like fra’s. While I do not plan on upgrading and downgrading again. This is interesting and is worth looking into.

4
  1. Create backup before upgrading
  2. Upgrade
  3. Try what you need
  4. Downgrade
  5. Load backup.

No problems

5

Probably you are not talking about router os, because in mikrotik router os v2.9.x you CAN specify port ranges (I did it and I still do it on many routers) :laughing:
EDIT:
port ranges REMAINS in all firewall filter rules except the last one!

6

Yeah sorry just missed something. :laughing: