Community discussions

MikroTik App

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by azg
Tue Jan 25, 2011 8:20 pm
Forum: General
Topic: Packet drop when connecting through Winbox.
Replies: 4
Views: 932

Re: Packet drop when connecting through Winbox.

the comment was "they are routers, not file servers". http://forum.mikrotik.com/viewtopic.php?f=2&t=46773 i run video equipment, and even without writes to flash the statistics show around 100ppm loss when the traffic flows through MT. this is considered "good enough" in this forum, so don't expect ...
by azg
Tue Jan 25, 2011 3:27 pm
Forum: Forwarding Protocols
Topic: BGP & IPv6
Replies: 28
Views: 4576

Re: BGP & IPv6

is this bug documented somewhere in this forum?
by azg
Tue Jan 25, 2011 3:22 pm
Forum: General
Topic: BGP support
Replies: 3
Views: 698

Re: BGP support

with a full eBGP table and an iBGP peer i measure around 500MB memory used, at currently just below 350'000 routes in the table. i would choose a router with 1GB of RAM, 512 is not enough in my view also because the table grows. usually means PC hardware. make sure the network card you select is sup...
by azg
Mon Jan 24, 2011 12:01 am
Forum: Forwarding Protocols
Topic: eBGP routes all inactive due to gateway unreachable
Replies: 17
Views: 4649

Re: eBGP routes all inactive due to gateway unreachable

yes complete, unaltered config of 1:1 exactly the problem would help.
i wonder in particular for the peering networks how come there are /31 subnets.
by azg
Sat Jan 22, 2011 1:18 pm
Forum: Forwarding Protocols
Topic: eBGP routes all inactive due to gateway unreachable
Replies: 17
Views: 4649

Re: eBGP routes all inactive due to gateway unreachable

this is full of manual edits -- sorry, you're on your own that way. i don't understand why people are so afraid of telling their IP or AS numbers. also -- the config does not look like being real with two upstream BGP peers being a.a.16.214 and a.a.16.216... normally the providers assign addresses t...
by azg
Fri Jan 21, 2011 12:09 pm
Forum: Forwarding Protocols
Topic: Newbie BGP Problems
Replies: 5
Views: 1073

Re: Newbie BGP Problems

synchronize=yes -- read what this does.

andy
by azg
Fri Jan 21, 2011 12:07 pm
Forum: Forwarding Protocols
Topic: eBGP routes all inactive due to gateway unreachable
Replies: 17
Views: 4649

Re: eBGP routes all inactive due to gateway unreachable

it might be helpful if you post actual routes (unchanged / original IPs) and interface information.
by azg
Fri Jan 21, 2011 12:02 pm
Forum: Forwarding Protocols
Topic: Got a problem with L2tp
Replies: 3
Views: 795

Re: Got a problem with L2tp

To disable IPSec: on XP, locate
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
Add new DWORD Value named ProhibitIpSec, set to 1 , Restart the computer.
by azg
Tue Jan 18, 2011 2:58 pm
Forum: General
Topic: POE on RB750G ?
Replies: 4
Views: 1372

Re: POE on RB750G ?

i assume the "passive" term in mikrotik language refers to mikrotik-POE not using any POE negotiation like 802.3af does. the idea behind 802.3af negotiation is to prevent incompatible devices from being powered with 48V. but that is exactly what happens with mikrotik-POE. it's too close to 802.3af b...
by azg
Tue Jan 18, 2011 1:22 pm
Forum: General
Topic: POE on RB750G ?
Replies: 4
Views: 1372

Re: POE on RB750G ?

the RB750G is not compatible with IEEE 802.3af power-over-ethernet -- it's stated in the data sheet. one difference is that the RB750G accepts a maximum voltage 28V, while 802.3af typically feeds 48V to a device (the range goes up to 57.0V). the power regularor on the RB750G (Cheertech RT9206) has a...
by azg
Wed Jan 05, 2011 9:09 pm
Forum: General
Topic: View/manipulate interface tx queue length
Replies: 3
Views: 3153

Re: View/manipulate interface tx queue length

there was a issue that related to queue sizes of the ethernet controller, in this case it was the RX queue which was of unknown size & not changeable, and led to packet loss. see http://forum.mikrotik.com/viewtopic.php?f=2&t=46764 i'm not aware of any way to obtain RX/TX queue sizes, nor whether the...
by azg
Thu Dec 23, 2010 2:56 pm
Forum: General
Topic: Thank You / Merry Christmas
Replies: 3
Views: 703

Thank You / Merry Christmas

dear mikrotik - dear normis, janis, mrz i wish you merry chistmas and a happy end of the year, and would like to include thanks for the products you make. the products, while not perfect in all details, enable us to do things we were not able to do before, and in many ways the products are excellent...
by azg
Tue Dec 14, 2010 2:18 pm
Forum: General
Topic: double or triple NAT is bad?
Replies: 13
Views: 7533

Re: double or triple NAT is bad?

useless from the perspective what an end customer can do with it. it feels like the IPv4 'web' clearly before 1994. technically IPv6 fine, say, except for the sort of things like OSPF requiring IPsec, IPsec not being implemented in lots of places, etc. here too, the state of development gives me tha...
by azg
Tue Dec 14, 2010 11:43 am
Forum: General
Topic: double or triple NAT is bad?
Replies: 13
Views: 7533

Re: double or triple NAT is bad?

yes i think unfortunately we are all soon going to explore those 'very interesting issues at the ISP level'...
IPv6 is still useless --
by azg
Sun Dec 12, 2010 3:40 pm
Forum: General
Topic: double or triple NAT is bad?
Replies: 13
Views: 7533

Re: double or triple NAT is bad?

the reason ISPs try to stay away from NAT is that NAT does not mix well with redundant links and redundant routers. for example, if your network is "flat" (without NAT), you can add additional links between your POPs, and let OSPF manage the routing. you can add additional capacity like that, and if...
by azg
Sat Dec 04, 2010 3:54 pm
Forum: General
Topic: 10G compatibility/performance with Mikrotik?
Replies: 81
Views: 18847

Re: 10G compatibility/performance with Mikrotik?

regarding 10G on mikrotik: i manage a video transmission system for a customer - three streams with 10-15Mbps each, from europe to the u.s. east coast. two of the three systems have error correction, one of them gives detailed output. i operate a total of four routers: a MT RB750G (4.13) and an old ...
by azg
Fri Nov 26, 2010 9:41 am
Forum: General
Topic: 10G compatibility/performance with Mikrotik?
Replies: 81
Views: 18847

Re: 10G compatibility/performance with Mikrotik?

FIPTech, what about packet loss with 10Mbit flowing through the router & being reflected, using the 1518 Byte frames (similar to RTP video), or using 200 Byte frames (approximately VOiP traffic with G.711 20ms RTP)? macgaiver: i agree completely that for less than $100 these are excellent routers. F...
by azg
Thu Nov 25, 2010 4:19 pm
Forum: General
Topic: 10G compatibility/performance with Mikrotik?
Replies: 81
Views: 18847

Re: 10G compatibility/performance with Mikrotik?

i read your posts normis, and the complaint i made i think was fairly clear: effectively i ask you to be polite with someone who spends his time to test your gear. also I don't think FIPTech has claimed 5Gbps to be a limit. he has merely tested a small router, and has run into an issue. so back to t...
by azg
Thu Nov 25, 2010 3:59 pm
Forum: General
Topic: 10G compatibility/performance with Mikrotik?
Replies: 81
Views: 18847

Re: 10G compatibility/performance with Mikrotik?

Normis, as beccara's boss recently expressed, it is really your product and your choice what you do with it. Here with FIPTech you have someone spending his time to test your product using professional gear. Why not appreciate it? Instead of flat rejecting his measurement, you could have hinted that...
by azg
Thu Nov 25, 2010 3:19 pm
Forum: General
Topic: 10G compatibility/performance with Mikrotik?
Replies: 81
Views: 18847

Re: 10G compatibility/performance with Mikrotik?

FIPTech, thanks for these tests. do you see increased packet loss when you copy a file to the router's flash? or, when you backup config into a file on the router's flash? note that these routers (450G/750G) do not have 5 ethernet ports, but merely 2 ethernet ports of which one goes through a switch...
by azg
Thu Nov 25, 2010 9:43 am
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

summarized: - OSPF does not work from VRFs with no MPLS. - the problem is debugged and documented above. - the required change would be small -- different interpretation of a single bit (DN). looks like there is no interest.... kolpano, do you have an open ticket for this? have you formally updated ...
by azg
Thu Nov 25, 2010 9:24 am
Forum: General
Topic: RX Drops 450G v4.13
Replies: 8
Views: 3226

Re: RX Drops 450G v4.13

glad it helped. yep -- it can be irrational to reduce the speed of an interface to eliminate packet drops --- normally we try to increase speeds to fix such a problem. but that's how it is when the RX ring is too small. i'd still be interested to learn from MT the RX buffer sizes for RB450/750G and ...
by azg
Sun Nov 21, 2010 12:02 am
Forum: General
Topic: RX Drops 450G v4.13
Replies: 8
Views: 3226

Re: RX Drops 450G v4.13

when you reduce to 100Mbps, has the probability of RX drop (i.e. how man drops per million packets received, ppm) changed?? what is the drop rate? another possible issue could be that the kernel is busy (blocked) and temporarily can not process packets. one candidate is Flash writes: can you see inc...
by azg
Fri Nov 19, 2010 1:37 pm
Forum: General
Topic: RX Drops 450G v4.13
Replies: 8
Views: 3226

Re: RX Drops 450G v4.13

first you can try to reduce the port speeds to 100Mbps, especially the one towards your PC. the problem can be that traffic from the PC via gigabit ethernet arrives as bursts, i.e. many packets at a full 1Gbps, then for a while nothing, then again a series of packets back-to-back at 1Gbps etc. speci...
by azg
Thu Nov 18, 2010 3:33 pm
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

kolpano, i can confirm your findings: OSPF redistribution of connected and static routes does not work for OSPF instances within a VRF (more precise mechanism given below, the issue is on the receiving side). this happens in a small test network similar to yours & it also happens on our production n...
by azg
Tue Nov 16, 2010 12:50 am
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

give me 1-2 days to replicate your config. i'm getting a couple RB750G tomorrow & will try to re-create your setup - andy
by azg
Mon Nov 15, 2010 10:15 am
Forum: Forwarding Protocols
Topic: Odd: Anyone able to provide a full bgp table for testing
Replies: 2
Views: 1082

Re: Odd: Anyone able to provide a full bgp table for testing

possible. send me as private message your BGP router IP address, your email address and phone number.
andy
by azg
Fri Nov 12, 2010 11:35 am
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

i don't know if you still care as you have RIP working, but to be able to see the exact details of your setup, you'd need to post the actual configuration: interface addresses, static routes, ospf instances, ospf interfaces. as it is a small setup it should be reasonably easy to find the problem. i ...
by azg
Thu Nov 11, 2010 4:04 pm
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

well that is a top level view, yes. but obviously something is not as you expect it, so there probably is something in the details not as identical as you'd expect. you really have to dig into the details to find an issue: - you write there is an LSA for your static routes, so OSPF *IS* redistributi...
by azg
Thu Nov 11, 2010 3:00 pm
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

well, the OSPF instance IS redistributing your static routes then. it's merely a network / OSPF configuration issue then. are the destination IPs in question (those behind the static route entries) reachable from other OSPF routers in your network? if yes then OSPF simply found a better path to them...
by azg
Thu Nov 11, 2010 10:14 am
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

i use redistribution of static routes into OSPF, all within a VRF. (the discussion so far was about connected routes).
are the routes you want to redistribute in the same VRF as the OSPF instance that should see them?
by azg
Wed Nov 10, 2010 2:47 pm
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

kolpano, i believe there are two areas on MT routers where you need to test everything you use: 1. anything related to VRFs. make sure you understand not only how your forward traffic is processed, but keep a keen eye on how the packets come back. also remember that the router itself is in the main ...
by azg
Wed Nov 10, 2010 2:15 pm
Forum: Forwarding Protocols
Topic: OSPF & tunnels & IP addrs used
Replies: 2
Views: 1419

Re: OSPF & tunnels & IP addrs used

across the entire network, i allocate unique L2TP interface addresses from 192.168.100.0/24, one after the other... OSPF has a network entry for 192.168.100.0/24, on each router. i tend to cover large ranges with a single network statement. the missing HELLO packets have occured last yesterday, on a...
by azg
Wed Nov 10, 2010 1:11 pm
Forum: RouterBOARD hardware
Topic: mikrotik power over ethernet supported for cisco ?
Replies: 8
Views: 9396

Re: mikrotik power over ethernet supported for cisco ?

i actually had a conflict between a Cisco/Linksys SRW208P POE switch and a RB750G: the customer had connected Eth1 of the RB750G, which has some POE electronics, to this switch. the RB750G had its own wall plug power supply, it was not planned to be POE fed. the effect was what seemed like a unpower...
by azg
Wed Nov 10, 2010 12:57 pm
Forum: Forwarding Protocols
Topic: OSPF & tunnels & IP addrs used
Replies: 2
Views: 1419

OSPF & tunnels & IP addrs used

hello, i recently had an issue with an L2TP tunnel as a point-to-point interface under 4.12 OSPF: one of the OSPF sides was not sending HELLO packets. it is an effect i remember occuring for several versions. so far i had not spent attention to the IP addresses assigned to the L2TP interfaces - i th...
by azg
Wed Nov 10, 2010 12:39 pm
Forum: Forwarding Protocols
Topic: BGP Stabillity/Lock Ups
Replies: 16
Views: 4250

Re: BGP Stabillity/Lock Ups

its stable since 4.10, full table, two upstreams 100Mbps ea.

the winbox issue described here http://forum.mikrotik.com/viewtopic.php ... 3&start=55
seems to have been at least reduced as of 4.13.

otherwise not a single issue. we were never offline, not a minute.
by azg
Wed Nov 10, 2010 12:21 pm
Forum: Forwarding Protocols
Topic: TWO OSPF VRF Instances`
Replies: 30
Views: 16008

Re: TWO OSPF VRF Instances`

i use a single OSPF instance in a VRF on most routers i have. however i don't use redistribution of connected routes: instead, my network statements cover all local networks. that way OSPF adds dynamic interfaces based on the settings in the "all" interface (for all interfaces that don't already hav...
by azg
Thu Oct 14, 2010 11:16 am
Forum: General
Topic: L2TP VPN between HeadOffice & Remote Location
Replies: 2
Views: 932

Re: L2TP VPN between HeadOffice & Remote Location

in effect what you want is to route only specific IPs to the main office, the rest should go through NAT/masquerading at the branch office and should be sent to the internet there. start with a NAT rule at the branch office that sends all traffic towards the internet so that you can browse the net -...
by azg
Wed Sep 29, 2010 1:07 pm
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22

BGP on 4.11 (x86 w/ 1GB in my case) has been stable for weeks in my case. I have two routers for two upstream peers, full tables, IBGP between the routers, and around 20 route filters per router. I'd say it is actually good... There ARE however some bugs as discussed in this thread. For me the real ...
by azg
Thu Sep 16, 2010 10:22 pm
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22

It looks like BGP can become slow if routing filters are changed. Anyone who experience BGP problems after routing filter changes, please contact support and specify what routing filters you had and what changes you have made. it seems to me that it is not the route filters themselves, but merely a...
by azg
Thu Sep 16, 2010 9:31 pm
Forum: Forwarding Protocols
Topic: BGP over L2TP?
Replies: 7
Views: 4033

Re: BGP over L2TP?

i tested a fix using NAT during the last week. first, the mangle/NAT config as given by mrz above does not work: a L2TP client does not necessarily use src port 1701, so in postroute to trigger on dst-port 1701 is probably incorrect. also it seems to me that the connection tracking as given does not...
by azg
Wed Sep 08, 2010 4:19 pm
Forum: Forwarding Protocols
Topic: BGP over L2TP?
Replies: 7
Views: 4033

Re: BGP over L2TP?

Mark connections for incoming L2TP packets and set up routing marks or NAT to ensure that reply to specific connection is sent out via correct interface. that does not work. details of the test: "input" chain UDP dst port 1701 gets a connection mark i call "L2TP". the packet from the L2TP client cr...
by azg
Wed Sep 08, 2010 2:59 pm
Forum: Forwarding Protocols
Topic: BGP over L2TP?
Replies: 7
Views: 4033

Re: BGP over L2TP?

This does not work beause of a bug in the L2TP server: When a L2TP client attempts to log into the L2TP server, the L2TP server does not always send its reply packets from the correct IP address. The client sees an answer packet coming back, but it carries the wrong source IP, so it discards the pac...
by azg
Tue Aug 24, 2010 4:31 pm
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22

blake, from my experience with a process alone you can not bring down other processes the way we see here, the scheduler would keep the system minimally responsive. that is why i suspect that the CPU is stuck in the kernel (during inserting a new route into the FIB) -- i had similar things in my own...
by azg
Tue Aug 24, 2010 1:16 pm
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22

the problem maxrate describes starts to happen on a x86 as well - it actually takes less than three peers to bring it down. my x86 mikrotik is connected via a 100Mbps Ethernet link to the Equinix-1 data center in Zurich, Switzerland, to a Cogent 100Mbps port. above in this thread, i asked mrz whethe...
by azg
Sun Aug 08, 2010 11:08 am
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22

mrz: sure "30 minutes is not normal". but this is not the first time this issues comes up. last november you wrote under the thread "Taking full BGP routes | resources RB1000": "RB1000 can receive full BGP feed and install routes in few minutes and functions without any noticeable problems." would ...
by azg
Sun Aug 08, 2010 10:24 am
Forum: Forwarding Protocols
Topic: OSPF / VRF Connected/Static route redistribution
Replies: 3
Views: 5218

Re: OSPF / VRF Connected/Static route redistribution

i use VRF & OSPF & redistribution of static routes, and it works (4.10 on x86, no MPLS). make sure your VRF interfaces are all listed under /ip route vrf. in my case, the static route's gateway is reachable through an interface that is part of the VRF, i.e. it is NOT pointing outside the VRF. to bet...
by azg
Wed Jul 21, 2010 12:07 pm
Forum: Forwarding Protocols
Topic: BGP full table Large CPU usage on rb1000 3.22
Replies: 62
Views: 21128

Re: BGP full table Large CPU usage on rb1000 3.22 / x86

i can confirm BGP in 4.10 is improved: on a x86 system for the first time i was able to accept the full 320'000 prefixes from one peer, and the same BGP session was up for two weeks now. i still use traffic shaping for the BGP session itself, to less than 100kbps. with 4.6 shaping was the only way t...
by azg
Thu Jun 17, 2010 3:06 pm
Forum: General
Topic: Policy Routing - L2TP and multiple WANs
Replies: 14
Views: 11151

Re: Policy Routing - L2TP and multiple WANs

i can confirm: the bug is in the L2TP server. it sends its packets _without specifying a sender IP_. the packets then get routed, and end up on an egress interface... and HERE the source IP gets assigned. what you see on the wire is the IP of the egress interface. of course this is wrong. an outside...