OSPF -> /32 -> WDS

Freman · Fri Jan 07, 2005 6:18 am

Ok, I'm not entirely sure what's going on here...

I've got 2 mikrotiks communicating across an Atheros 5.8ghz link using WDS...

I can ping both devices but OSPF refuses to talk.

Can anyone help, attached is my configuration

MikrotikA

/ ip address 
add address=172.16.12.1/32 network=172.16.12.2 broadcast=255.255.255.255 \
    interface=wds1 comment="" disabled=no 
add address=192.168.0.251/24 network=192.168.0.0 broadcast=192.168.0.255 \
    interface=ether1 comment="" disabled=no

/ ip route 
add dst-address=0.0.0.0/0 preferred-source=0.0.0.0 gateway=192.168.0.1 \
    distance=1 comment="" disabled=no 

/ routing ospf 
set router-id=0.0.0.0 distribute-default=if-installed-as-type-1 \
    redistribute-connected=as-type-1 redistribute-static=no \
    redistribute-rip=no redistribute-bgp=no metric-default=1 \
    metric-connected=20 metric-static=20 metric-rip=20 metric-bgp=20 
/ routing ospf area 
set backbone area-id=0.0.0.0 authentication=none disabled=no 
/ routing ospf interface 
add interface=wds1 cost=1 priority=1 authentication-key="" \
    retransmit-interval=5s transmit-delay=1s hello-interval=10s \
    dead-interval=40s 
/ routing ospf network 
add network=172.16.12.2/32 area=backbone disabled=no

MikrotikB

/ ip address 
add address=172.16.12.2/32 network=172.16.12.1 broadcast=255.255.255.255 \
    interface=wds1 comment="" disabled=no 

/ routing ospf 
set router-id=0.0.0.0 distribute-default=never \
    redistribute-connected=as-type-1 redistribute-static=no \
    redistribute-rip=no redistribute-bgp=no metric-default=1 \
    metric-connected=20 metric-static=20 metric-rip=20 metric-bgp=20 
/ routing ospf area 
set backbone area-id=0.0.0.0 authentication=none disabled=no 
/ routing ospf interface 
add interface=wds1 cost=1 priority=1 authentication-key="" \
    retransmit-interval=5s transmit-delay=1s hello-interval=10s \
    dead-interval=40s 
/ routing ospf network 
add network=172.16.12.1/32 area=backbone disabled=no

workshop · Tue Jan 11, 2005 10:25 pm

1) Both your MT's have the same OSPF Router ID.
Try this command on one of your MT's:-

routing ospf set router-id=0.0.0.1

2) And *possibly* (I'll have to double check this):-
From memory /32 doesnt work properly as an OSPF network.

/ routing ospf network add network=172.16.12.2/32
should read
/ routing ospf network add network=172.16.12.0/24

Only try 2) if 1) doesnt fix the problem....

mag · Wed Jan 12, 2005 10:04 am

ospf router id should be the highest ip-addess given to a local osp-interface.

see: http://relcom.net/CURS/OSPF/1.html

the wireless ip subnet is misconfigured (as mentioned by freman). /32 subnets are talking only to themself.

Freman · Thu Jan 13, 2005 6:58 am

You should set the network address exactly the same as the remote point IP address for
point-to-point links. The right netmask in this case is /32.

If you don't specify a the routerid it will automaticly discover/allocate one.

router-id (IP address; default: 0.0.0.0) - OSPF Router ID. If not specified, OSPF uses the largest
IP address configured on the interfaces as its router ID

I've since tried the following configuration...

Machine 1:
/ip address add address=172.16.13.1/32 network=172.16.13.2 interface=wds1
/routing ospf network add 172.16.13.2/32 area=backbone disabled=no
/routing ospf interface add interface=wds1
/routing ospf set distribute-default=as-type-1

Machine 2:
/ip address add address=172.16.13.2/32 network=172.16.13.1 interface=wds1
/routing ospf network add 172.16.13.1/32 area=backbone disabled=no
/routing ospf interface add interface=wds1
/routing ospf set redistribute-connected=as-type-1

The OSPF still isn't working...

I can ping between the routers fine...

I know it looks the same but it sets the broadcast to the same address as the network this way.

The manual says I can configure ospf for a point to point link, so far I've been unable to achive this.

More ideas?

mag · Thu Jan 13, 2005 9:21 am

You should set the network address exactly the same as the remote point IP address for
point-to-point links. The right netmask in this case is /32.

i meant the ip-address of the interface itself, not the ospf-interface. a /32 ip-address usually does not make sense.

If you don't specify a the routerid it will automaticly discover/allocate one.
router-id (IP address; default: 0.0.0.0) - OSPF Router ID. If not specified, OSPF uses the largest
IP address configured on the interfaces as its router ID

hmm, i didn't follow the manual in this case (and OSPF is working for me...;-)

I've since tried the following configuration...

Machine 1:
/ip address add address=172.16.13.1/32 network=172.16.13.2

...

Machine 2:
/ip address add address=172.16.13.2/32 network=172.16.13.1 interface=wds1

i dont't think thats correct./routing ospf network add 172.16.13.1/32

why not using some standard transfer-net between the routers, e.g.
rt1: 172.16.13.1/30
rt2: 172.16.13.2/30
(network 172.16.13.0/30)

perhaps i misunderstood this: are you trying to configure an unnumberd point-to-point link?

i haven't tried OSPF on unnumbered point-to-point links yet. (if someone has a working configuration for this, i would be interested to know:)

regards.
matthias

OSPF -> /32 -> WDS

OSPF -> /32 -> WDS

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