Hi,
I usually connect to a Mikrotik device (RB750Gr3, RouterOS 6.36.1) through a L2TP tunnel.
This Mikrotik is connected to Internet through a PPPoE device.
PPPoE access controller is Mikrotik, too (CCR1036, RouterOS 6.37.1).
I noticed that, during telnet session, if I type some command with a short output, everything is fine.
If the output command is longer (eg. /log print), TCP connection hangs in an irreversible way.
I must open a second telnet session to work again.
I get this behavior with different CPE, so probably my problem is on PPPoE access controller, and I am trying to figure this..
This is network capture while problem occours:
PPPoE server interface is configured with MRU and MTU = 1450
Other relevant configuration:
/ppp profile
add change-tcp-mss=no dns-server=8.8.8.8,8.8.4.4 local-address=172.16.1.1 name=profile1 only-one=yes
add local-address=10.20.20.1 name=profile-pptp use-ipv6=no
/interface pppoe-server server
add default-profile=profile1 disabled=no interface=vlan2 max-mru=1450 max-mtu=1450 one-session-per-host=yes service-name=service2
/ip firewall filter
add action=fasttrack-connection chain=forward connection-state=established,related disabled=yes
add action=accept chain=input connection-state=established,related
add action=accept chain=input protocol=ospf
add action=accept chain=input protocol=icmp
add action=accept chain=input dst-port=1723 protocol=tcp
add action=drop chain=input
/ip firewall mangle
add action=change-mss chain=forward new-mss=1350 passthrough=yes protocol=tcp tcp-flags=syn tcp-mss=1401-65535
Any suggestion?
Thank you!