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Dialup connected but no ping

Posted: Wed Sep 13, 2017 10:10 pm
by Ponyo
Dear Sirs,
we have a serial modem (CINTERION GEMALTO BGS2T) connected to a mikrotik RB953GS-5Hnt, we are using this as a ppp-client.
remote host: 192.168.254.2
local address assigned by dialup 192.168.254.3

[admin@MikroTik] > /interface ppp-client print
Flags: X - disabled, R - running
 0  R name="ppp-dialup" max-mtu=1500 max-mru=1500 mrru=disabled port=serial0
      data-channel=0 info-channel=0 pin="" user="ProvaDialUp" password="ooo"
      profile=default phone="xxxxxxxxxx" dial-command="ATD" modem-init="ATE0V1"
      null-modem=no dial-on-demand=no add-default-route=no use-peer-dns=no
      keepalive-timeout=0 allow=chap,mschap1,mschap2
/ppp profile
set *0 change-tcp-mss=default use-compression=yes
/ip firewall nat
add action=masquerade chain=srcnat out-interface=ether2
add action=dst-nat chain=dstnat comment="redirect to dialup" dst-port=88 \
    log=yes log-prefix=redirectPPP protocol=tcp to-addresses=192.168.254.2 \
    to-ports=80
add action=masquerade chain=srcnat out-interface=ppp-dialup src-address=\
    192.168.1.0/24
add action=dst-nat chain=dstnat disabled=yes dst-port=88 log=yes log-prefix=\
    proxy protocol=tcp to-ports=8080
/ip route
add distance=1 gateway=192.168.1.1   # main gateway
add distance=1 dst-address=192.168.254.0/32 gateway=ppp-dialup scope=10
The connection is established and we can reach the http server on the remote address.
But in status tab we see errors in RX and loading speed of the http page is extremely slow, instead with a Windows XP connection it's incredibily fast.
We can't also ping the remote address from meny Tools> ping.

Are there special config to make the ppp work as it work on Windows XP?

Waiting for your kindly reply, BR.

Re: Dialup connected but no ping

Posted: Wed Sep 13, 2017 10:12 pm
by thekrzos
MTU?

Wysłane z mojego Redmi Note 3 przy użyciu Tapatalka

Re: Dialup connected but no ping

Posted: Thu Sep 14, 2017 10:06 pm
by Ponyo
with MTU and MRU of 1500 it takes 2 minutes to load an html page
with MTU and MRU of 576 it takes 1 minutes to load an html page

the speed on the ppp interface is 9600

there is a way to calculate the correct value to set?
still getting Rx Errors and cannot ping the remote host