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False dynamic route

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szaszg
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False dynamic route

Fri Apr 29, 2022 12:50 pm

Hello!

My problem:
An RBD52G-5HacD2HnD
Firmware Type ipq4000L
Factory Firmware 6.45.9
Current Firmware 6.47.9
Code: Select all
[admin@MikroTik] > /interface print 
Flags: D - dynamic, X - disabled, R - running, S - slave 
 #     NAME                                TYPE       ACTUAL-MTU L2MTU  MAX-L2MTU MAC-ADDRESS      
 0  R  ether1                              ether            1500  1598       9214 2C:C8:1B:EE:A0:87
 1   S ether2                              ether            1500  1598       9214 2C:C8:1B:EE:A0:88
 2  RS ether3                              ether            1500  1598       9214 2C:C8:1B:EE:A0:89
 3   S ether4                              ether            1500  1598       9214 2C:C8:1B:EE:A0:8A
 4   S ether5                              ether            1500  1598       9214 2C:C8:1B:EE:A0:8B
 5     wlan1                               wlan             1500  1600       2290 2C:C8:1B:EE:A0:8C
 6  X  wlan2                               wlan             1500  1600       2290 2C:C8:1B:EE:A0:8D
 7     wlan3                               wlan             1500  1600       2290 2E:C8:1B:EE:A0:8C
 8  R  ;;; defconf
       bridge                              bridge           1500  1598            2C:C8:1B:EE:A0:88
 9  X  bridge1                             bridge                                 2C:C8:1B:EE:A0:8C

[admin@MikroTik] > /interface bridge print 
Flags: X - disabled, R - running 
 0 R ;;; defconf
     name="bridge" mtu=auto actual-mtu=1500 l2mtu=1598 arp=reply-only arp-timeout=auto mac-address=2C:C8:1B:EE:A0:88 protocol-mode=rstp fast-forward=yes igmp-snooping=no 
     auto-mac=no admin-mac=2C:C8:1B:EE:A0:88 ageing-time=5m priority=0x8000 max-message-age=20s forward-delay=15s transmit-hold-count=6 vlan-filtering=no dhcp-snooping=no 

 1 X name="bridge1" mtu=1500 arp=enabled arp-timeout=auto mac-address=2C:C8:1B:EE:A0:8C protocol-mode=rstp fast-forward=yes igmp-snooping=no auto-mac=yes ageing-time=5m 
     priority=0x8000 max-message-age=20s forward-delay=15s transmit-hold-count=6 vlan-filtering=no dhcp-snooping=no 

[admin@MikroTik] > /interface bridge port print 
Flags: X - disabled, I - inactive, D - dynamic, H - hw-offload 
 #     INTERFACE                                              BRIDGE                                              HW  PVID PRIORITY  PATH-COST INTERNAL-PATH-COST    HORIZON
 0 I H ;;; defconf
       ether2                                                 bridge                                              yes    1     0x80         10                 10       none
 1   H ;;; defconf
       ether3                                                 bridge                                              yes    1     0x80         10                 10       none
 2 I H ;;; defconf
       ether4                                                 bridge                                              yes    1     0x80         10                 10       none
 3 I H ;;; defconf
       ether5                                                 bridge                                              yes    1     0x80         10                 10       none

[admin@MikroTik] > /ip address print
Flags: X - disabled, I - invalid, D - dynamic 
 #   ADDRESS            NETWORK         INTERFACE                                                                                                                           
 0   ;;; defconf
     192.168.88.1/24    192.168.88.0    wlan1                                                                                                                               
 1   10.1.99.2/16       10.1.0.0        bridge                                                                                                                              

[admin@MikroTik] > /ip arp print
Flags: X - disabled, I - invalid, H - DHCP, D - dynamic, P - published, C - complete 
 #    ADDRESS         MAC-ADDRESS       INTERFACE                                                                                                                           
 0  C 10.1.254.255    00:50:56:A8:11:29 bridge                                                                                                                              
 1  C 10.1.240.131    7C:10:C9:84:C2:94 bridge                                                                                                                              

[admin@MikroTik] > /ip route print  
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit 
 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE
 0   S  0.0.0.0/0          81.xx.xx.43      ether1                    1
 1 A S  10.1.0.0/16                        bridge                    1
 2 ADC  81.xx.xx.40/29      10.1.99.2       bridge                    0
 3   S  81.xx.xx.40/29      81.xx.xx.43      ether1                    1
 4  DC  192.168.88.0/24    192.168.88.1    wlan1                   255
My problem is the route to "81.xx.xx.40/29 on bridge".
Why, and how can I flush this dynamic false route.

At the past I added IP address 81.xx.xx.43/29 to ether1 (and a static route too, to override the false route) but later i removed to router flush this dynamic route... but not.

I _do not_ want to reboot the device.

Thanks a lot,
Gergely
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Re: False dynamic route

Fri Apr 29, 2022 12:58 pm

results of:
/ip address export
and
/ip route export
?
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anav
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Re: False dynamic route

Fri Apr 29, 2022 4:22 pm

You should be using latest long term ver 6.48 the last 6 firmware long term available, as we wait for a vers 7 long term
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szaszg
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Re: False dynamic route

Fri Apr 29, 2022 5:57 pm

Code: Select all
[admin@MikroTik] > /ip address export
# jan/03/1970 04:56:30 by RouterOS 6.47.9
# software id = UHGL-4QHH
#
# model = RBD52G-5HacD2HnD
# serial number = <CENSORED>
/ip address
add address=192.168.88.1/24 comment=defconf interface=wlan1 network=192.168.88.0
add address=10.1.99.2/16 interface=bridge network=10.1.0.0

Code: Select all
[admin@MikroTik] > /ip route export
# jan/03/1970 04:57:23 by RouterOS 6.47.9
# software id = UHGL-4QHH
#
# model = RBD52G-5HacD2HnD
# serial number = <CENSORED>
/ip route
add distance=1 gateway=ether1 pref-src=81.xx.xx.43
add distance=1 dst-address=10.1.0.0/16 gateway=bridge
add distance=1 dst-address=81.xx.xx.40/29 gateway=ether1 pref-src=81.xx.xx.43

Thanks!
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Re: False dynamic route

Fri Apr 29, 2022 6:19 pm

Effectively, this is internal problem...
Probably reboot solve the problem.
I understand you do not want boot, but on that occasion, I suggest at same time to upgrade to 6.48.6 long-term
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tdw
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Re: False dynamic route

Fri Apr 29, 2022 6:41 pm

Using gateway=interfacename is only valid for point-to-point interfaces, not ethernet, you should specify an address. Directly-attached routes will be added automatically from the addresses and netmasks specified /ip address. You only have to use pref-src= if you have multiple IP addresses on the same interface.

/ip route
add distance=1 gateway=ether1yourgatewayaddress pref-src=81.xx.xx.43
add distance=1 dst-address=10.1.0.0/16 gateway=bridge
add distance=1 dst-address=81.xx.xx.40/29 gateway=ether1 pref-src=81.xx.xx.43

Presumably the ether1 IP address is obtained by DHCP as it is not present in /ip address
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Re: False dynamic route

Fri Apr 29, 2022 6:56 pm

Presumably the ether1 IP address is obtained by DHCP as it is not present in /ip address
:shock: ah... I must sleep, I do not have noticed that... :roll:

At this point is better to do not add manually routes at all, but leave the DHCP create appropriate route...
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szaszg
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Re: False dynamic route

Fri Apr 29, 2022 9:26 pm

Presumably the ether1 IP address is obtained by DHCP as it is not present in /ip address
The ether1 address is the "internet" address of the router. It a static one. There is no DHCP (not "home" configuration).

I just remove it, because the router now cannot see any ip on that range and to drop the false route on "bridge"... but...

If i add back, i see:
Code: Select all
[admin@MikroTik] > /ip route print 
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit 
 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE
 0 A S  0.0.0.0/0          81.0.78.43      ether1                    1
 1 A S  10.1.0.0/16                        bridge                    1
 2 ADC  81.0.78.40/29      10.1.99.2       bridge                    0
                                           ether1            
 3   S  81.0.78.40/29      81.0.78.43      ether1                    1
 4  DC  192.168.88.0/24    192.168.88.1    wlan1                   255
At this point is better to do not add manually routes at all, but leave the DHCP create appropriate route...
O.K. I added static routes just to try to override the false one. But the dynamic route has "distance=0", and i can add only static routes with "distance=1" :(

BTW. if there are more than one route to dst. address the router should use the "longer way" if the packet not find the dst. on the "first" route, isn't it?

Gergely
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tdw
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Re: False dynamic route

Fri Apr 29, 2022 10:56 pm

You still incorrectly have gateways set to interfaces, not addresses. Post the output of /export hide-sensitive after redacting any public IP addresses, etc.
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szaszg
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Re: False dynamic route

Sat Apr 30, 2022 1:36 pm

Hmm...

When I remove the 10.1.99.2/16 ip from bridge than the false dynamic route is removed by mikrotik (it make sense of course, in retrospect :-) )

Thanks all,
Gergely
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