Community discussions

MikroTik App

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by atis
Fri May 28, 2010 2:29 pm
Forum: General
Topic: Howto multicast IPTV thru Mikrotik?
Replies: 12
Views: 24501

Re: Howto multicast IPTV thru Mikrotik?

if source is in different subnet, you can specify that in alternative subnet settings. And source address being in a different is exactly what usually happens when IGMP proxy is used. Mikrotik ISPs usually provide last-mile customer solutions, while e.g. IPTV streams usually originate somewhere far...
by atis
Thu May 27, 2010 8:53 pm
Forum: General
Topic: Howto multicast IPTV thru Mikrotik?
Replies: 12
Views: 24501

Re: Howto multicast IPTV thru Mikrotik?

I have seen much frustration and confusion with this alternative subnets option. And what's more, it seems to be not that useful at all. Yes, it can be used to filter out unwanted sources and avoid routing loops, but are these use cases so frequent? I don't know any other reasons why it's there. I s...
by atis
Tue Apr 06, 2010 11:28 am
Forum: Forwarding Protocols
Topic: BGP Noob: balance and failover on WAN not ISP
Replies: 7
Views: 3656

Re: BGP Noob: balance and failover on WAN not ISP

To create multipath routes with BGP, use multiple recursive next-hop resolution (http://wiki.mikrotik.com/wiki/Manual:BG ... interfaces), or use "set-in-nexthop" filter.
by atis
Tue Apr 06, 2010 11:22 am
Forum: General
Topic: NMBA-OSPF can network work with only one designated router.
Replies: 1
Views: 1058

Re: NMBA-OSPF can network work with only one designated rout

What i want to know is do i need to be connected directly to the designated router? Yes, all OSPF packets are sent with TTL 1, even in NBMA networks, so all OSPF neighbors must be directly connected (excluding neighbors on virtual-links and sham-links). On the other hand, in NBMA networks you need ...
by atis
Tue Apr 06, 2010 11:13 am
Forum: Forwarding Protocols
Topic: OSPF - I'm too stupid
Replies: 23
Views: 7133

Re: OSPF - I'm too stupid

Multi-area OSPF is a distance-vector protocol too. :)
As gregsowell said, you can filter in ABR routers, using ranges (/routing ospf area range).
External routes also can be filtered out, at their point of injection in the OSPF network.
by atis
Tue Apr 06, 2010 11:05 am
Forum: General
Topic: PPPoE IPv6
Replies: 10
Views: 3529

Re: PPPoE IPv6

Take in account that there often is a kind of hierarchy present in IPv6 addressing. If address autoconfiguration is used, the first 64 bits are network prefix, and the last 64 bits are determined by the MAC address of the host. This basically makes meaningless assigning network prefixes with mask la...
by atis
Thu Mar 11, 2010 12:18 am
Forum: General
Topic: Feature request: MPLS IPv6
Replies: 18
Views: 7680

Re: Feature request: MPLS IPv6

LDPv6 is something that even Cisco or Juniper don't have AFAIK. Reason: "no customer demand". That tells something about how useful it is in the real world, doesn't it? MPLS over IP would be nice too rather than having to do MPLS over EoIP over IP! Why can't you just run dual stack on your core rout...
by atis
Mon Mar 01, 2010 10:49 am
Forum: General
Topic: IGMP version with IGMP-proxy
Replies: 2
Views: 1613

Re: IGMP version with IGMP-proxy

Actually it's not so simple. IGMP proxy is a userspace program; itself it can process only IGMPv2 messages. But multicast join messages are sent by Linux kernel - the userspace only tells what multicast group to join. By default for recent Linux kernels the version is IGMPv3. The kernel sends out IG...
by atis
Wed Feb 24, 2010 10:20 am
Forum: Forwarding Protocols
Topic: BFD configuration
Replies: 21
Views: 14605

Re: BFD configuration

MichelePietravalle : also make sure you don't drop or de-prioritize BFD packets in your firewall. You may want to write special rules to handle these packets separately. I think ToS class "Internetcontrol" (two highest ToS bits set) is assigned to them, as well as to other routing protocol packets ...
by atis
Tue Feb 16, 2010 2:05 pm
Forum: Forwarding Protocols
Topic: BFD configuration
Replies: 21
Views: 14605

Re: BFD configuration

The logs you have posted so far do not show any problems with the operation of the protocol. On one end of the link a OSPF neighbor is lost (it timeouts?) and the BFD neighbor removed because of that ("reason: administrative change"). On the other end of the link, the corresponding OSPF and BFD neig...
by atis
Tue Feb 09, 2010 12:21 pm
Forum: Forwarding Protocols
Topic: IGMP Proxy BUG!
Replies: 10
Views: 4327

Re: IGMP Proxy BUG!

You can use static multicast routes (mfc entries) with IGMP proxy in case there is a problem with receiving IGMP join messages on dowstream interfaces....
by atis
Tue Feb 09, 2010 11:11 am
Forum: Forwarding Protocols
Topic: OSPF network creating two interfaces and other OSPF question
Replies: 7
Views: 3002

Re: OSPF network creating two interfaces and other OSPF question

It will not create two interfaces if there are two (or more) addresses with the same netmask, on the same interafce (e.g. 10.0.0.1/24 and 10.0.0.2/24). In this case one address is considered "primary" and the rest are "secondary". Try adding such addresses on plain Linux and see their description (r...
by atis
Mon Feb 08, 2010 10:51 am
Forum: General
Topic: Odd router lockup, error=No buffer space available
Replies: 13
Views: 6468

Re: Odd router lockup, error=No buffer space available

Sorry but it's not "the same problem". They are completely unrelated. You get "Operation not permitted" error when you have blocked OSPF packets in your firewall. You get "No buffer space available" error when the packet cannot be sent because the memory buffer space allocated for the sending socket...
by atis
Fri Feb 05, 2010 12:39 pm
Forum: General
Topic: Gateway interface, arp table overload
Replies: 2
Views: 777

Re: Gateway interface, arp table overload

This is not a bug, this is the expected behaviour.

In newer versions of RouterOS (including 3.x routing-test) you can specify both interface and nexthop ip address in gateway field (e.g. gateway=1.2.3.4%ether1), maybe this helps?
by atis
Fri Jan 29, 2010 5:11 pm
Forum: Forwarding Protocols
Topic: OSPF network creating two interfaces and other OSPF question
Replies: 7
Views: 3002

Re: OSPF network creating two interfaces and other OSPF question

documentation states: "Since v3.17 it is possible to run multiple OSPF instances. General OSPF configuration now is moved to instances. " but my router (V 3.30) does not know command /routing ospf instance. It knows it if you are using RouterOS v4, or RouterOS v3 with routing-test package. However ...
by atis
Mon Jan 25, 2010 5:16 pm
Forum: General
Topic: PIM interfce limit Reached
Replies: 5
Views: 1136

Re: PIM interfce limit Reached

This is a Linux kernel limitation, you can have maximum of 31 multicast interfaces. (Well, 32 in fact, but one index is always used for the automatically create "register" multicast tunnel interface). There are no real workarounds, except bridging the interfaces together, so that from routing protoc...