Dear Mikrotik Forum

Thanks for such a fantastic product! I've been running MikroTik boards for quite a few years now and I know them quite well. However, I have a problem now which is confusing me - if anyone can help I would be really grateful!

I have two upstream gateways, either of which can provide DNS: 10.0.0.1 and 10.0.0.4. On my own network, my RB750G has an external IP of 10.0.0.9 and my internal network is the usual 192.168.88.0/24

The weird thing is this: I make sure that "allow remote requests" is enabled, but after a while my network crawls to a standstill. This while can sometimes be a few hours and sometimes days or weeks. It's not predictable. And it doesn't seem to be related to how much or how little data I pull through.

I have discovered that when this happens, I have to log into the router at 192.168.88.1 and re-enable the "allow remote requests" option in DNS settings. It appears to have turned itself off randomly and I have to switch it back on each time!

Can anyone shed any light on this problem? I have a solution (logging in and re-enabling), but it means my network is not 100% and can fall over when I'm not there! I am the only one with access to this router and so it's not another admin doing this.

All the best!

Gareth

RouterBoard model?
BIOS version?
RouterOS version?
Package installed?
put "/ip dns export" result.

RouterBoard model? RB750G

BIOS version? Do you mean firmware? Firmware version is 2.29

RouterOS version? 5.12

Package installed?
[admin@Gareth_750G] > /system package print
Flags: X - disabled
# NAME VERSION SCHEDULED
0 hotspot 5.12
1 system 5.12
2 lcd 5.12
3 ppp 5.12
4 ipv6 5.12
5 calea 5.12
6 advanced-tools 5.12
7 dhcp 5.12
8 gps 5.12
9 security 5.12
10 wireless 5.12
11 user-manager 5.12
12 multicast 5.12
13 routing 5.12
14 ntp 5.12
15 routerboard 5.12
16 ups 5.12
17 mpls 5.12

put "/ip dns export" result.
[admin@Gareth_750G] > /ip dns export
# jan/01/2002 01:37:34 by RouterOS 5.12
# software id = IMKN-VWXN
#
/ip dns
set allow-remote-requests=yes cache-max-ttl=1w cache-size=512KiB \
max-udp-packet-size=50 servers=10.0.0.1,10.0.0.4
/ip dns static
add address=192.168.88.1 disabled=no name=router.g ttl=1d
add address=192.168.88.211 disabled=no name=rocquet.g ttl=1d
add address=192.168.222.222 disabled=no name=bladebox.g ttl=1d
add address=192.168.88.208 disabled=no name=shiloh.g ttl=1d
add address=192.168.88.235 disabled=no name=laptop.g ttl=1d
add address=192.168.88.207 disabled=no name=izcuintle.g ttl=1d
add address=192.168.88.210 disabled=no name=linksys.g ttl=1d

(the above export was after I had re-enabled the flag, obviously)

Very strange setting....

max-udp-packet-size=50 ???

upgrade RouterOS to 5.26

Wow! I was so focussed on the problem, I didn't see that ridiculously small max UDP!

Thanks for this - it seems to be a lot stable already. I will do the upgrade during the holiday next month

Very gratefully yours,

Gareth