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Sn1p3r
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PPTP problem - empty winbox

Sat Mar 09, 2019 11:25 am

Hello!

I got my home Mikrotik connected to Mikrotik at my work via PPTP connection.
All routes are made how it should, and it even worked before.

From home I can ping all devices on network, even the PPTP server Mikrotik.
When I try to connect to ANY Mikrotik at my work via I just got empty winbox, and it disconnects me after couple of seconds.

When I connect with my PC directly to PPTP Mikrotik server, everything works how it should.
What could be the issue? :)

Thanks
 
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mrz
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Re: PPTP problem - empty winbox

Mon Mar 11, 2019 9:17 am

MTU issue, set up mangle rules to reduce TCP MSS.
 
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Sn1p3r
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Re: PPTP problem - empty winbox

Mon Mar 11, 2019 3:37 pm

On which device I should set this?
I tried setting on both server and client, but still no luck.
 
nostromog
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Re: PPTP problem - empty winbox

Mon Mar 11, 2019 4:37 pm

Ensure that your firewall is allowing GRE related connections. If you don't it will not work

Enviado desde mi Redmi Note 5 mediante Tapatalk


 
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Sn1p3r
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Re: PPTP problem - empty winbox

Mon Mar 11, 2019 9:48 pm

I put my MAX MTU on PPTP connection to 1400 and it works great now.
It was 1450 before.
 
mjurman
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Re: PPTP problem - empty winbox

Mon Mar 11, 2019 11:19 pm

/ip firewall filter add chain=input protocol=gre action=accept

GRE overhead 24 bytes -> 1500 - 24 = 1476 MTU, but you should adjust mangle to change MSS
 
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Sn1p3r
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Re: PPTP problem - empty winbox  [SOLVED]

Sat Mar 23, 2019 11:10 pm

I put my MTU lower (1400) for PPTP connection and it works great!
 
thomsen
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Re: PPTP problem - empty winbox

Fri Apr 12, 2019 11:49 am

I put my MTU lower (1400) for PPTP connection and it works great!
Thank you for advice!
After change MTU and MRU for L2TP connection bandwidth test is working both ways

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