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very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 6:05 am
by CateFul
Very strange problem here. I have an EOIP tunnel for traffic to a certain pre-defined server. Ping through EoIP is excellent under 50ms as expected. However web access is quite slow it's like the response packet never got through. But, here's the even stranger part, if I go to Tools/Packet Sniffer and run it on the EoIP interface suddenly web access speed will be perfect as expected. Anyone knows what's going on here? I've been trying to solve this for the last week to no avail.

BTW, it's not just EoIP, happens with VPN connection as well. The local internet connection works fine though.

Here's my config:
[
[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  1596       2026 6C:3B:6B:21:3A:BD
 1  R  ether2-master                       ether            1500  1596       2026 6C:3B:6B:BD:3A:22
 2  RS ether3                              ether            1500  1596       2026 6C:3B:6B:BD:3A:23
 3  RS ether4                              ether            1500  1596       2026 6C:3B:6B:BD:3A:24
 4   S ether5                              ether            1500  1596       2026 6C:3B:6B:BD:3A:25
 5  R  eoip-hk                             eoip             1438 65535            02:55:E0:ED:4C:7A
 6  R  pppoe-out1                          pppoe-out        1480
[admin@MikroTik] > /interface eoip print
Flags: X - disabled, R - running 
 0  R name="eoip-hk" mtu=auto actual-mtu=1438 l2mtu=65535 mac-address=02:55:E0:**:**:** arp=enabled arp-timeout=auto 
      loop-protect=default loop-protect-status=off loop-protect-send-interval=5s loop-protect-disable-time=5m 
      local-address=local remote-address=remote tunnel-id=id dscp=inherit clamp-tcp-mss=yes 
      dont-fragment=no allow-fast-path=no 

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 6:07 am
by CateFul
I have to keep the packet sniffer running on the router for now.....it's routerboard rb750gr3

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 6:53 am
by drevil23
Hi,

I'm no expert, but I was watching this video https://youtu.be/3LmQYIQ5RoA?t=9m10s and the guy was saying that a fasttrack rule that was not configured properly had similar outcome, but was fixed using tools/torch, because it was disabling fasttrack by slowing all the packets down. Could it be the same cause?

Hope it helps.

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 10:39 am
by pe1chl
Yes, it means you need to turn off or limit the scope of FastTrack.
FastTrack is a shortcut around part of the functionality of the router, and it is temporarily disabled when you run tools
like the Packet Sniffer or Torch. Not all advanced uses can be combined with FastTrack.

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 2:01 pm
by CateFul
This is it! I disabled fast-track for eoip and it worked like a charm. Thank you so much for the help guys!

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 3:39 pm
by drevil23
No problem, it's been a pleasure ;-)

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 3:54 pm
by nordex
This should be reported sa bug. Please send it to support@mikrotik.com

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Sat Jun 10, 2017 6:03 pm
by Kindis
Please report this as I now have a case with simular issues but it applies to RDP connections. Need more people that point out fasttrack is now working sometimes on 6.39.x

Re: very strange slow web access but can be solved by packet sniffer?

Posted: Wed Mar 20, 2024 10:40 pm
by SMARTNETTT
This is it! I disabled fast-track for eoip and it worked like a charm. Thank you so much for the help guys!
Hi how you can disable fast-track only for eoip ?