Имеется 3G роутер Teleofis GTX-300 с установленной на нём RouterOS 5.6.
С этой осью дел не имел, но при помощи вебморды настроил, чтоб эта штуковина строила pptp тунель до нашщего сервера. Всё заработало, тунель построился, с сервера можно заходить на RoutesOS по тунелю и в обратную сторону.

После перезагрузки 3Г роутера туннель тоже построился, но по тунелю данные не ходят, а точнее если смотреть tcpdump на unix сервере, то видно что в отстроенный тунель пакеты улетают, но обратно ничего не прилетает. Если смотреть со стороны RoutesOS, то данные к нему из тунеля прилетают и он в тунель тоже данные отсылает, но до unix машины они не долетают. Пробовали вместо 3Г роутера ставить unix машину, всё идеально работает, дело где-то в 3g роутере, что-то блокирует трафик на другую сторону тунеля.

Я снял полный конфиг с роутера:

# aug/15/2012 19:16:05 by RouterOS 5.6
# software id = D6EM-LW6J
#
/interface ethernet
set 0 arp=enabled auto-negotiation=yes disabled=no full-duplex=yes l2mtu=1526 mac-address=00:0C:42:E0:79:AE mtu=1500 name=ether1 speed=\
    100Mbps
/interface wireless security-profiles
set default authentication-types="" eap-methods=passthrough group-ciphers="" group-key-update=5m interim-update=0s \
    management-protection=disabled management-protection-key="" mode=none name=default radius-eap-accounting=no radius-mac-accounting=no \
    radius-mac-authentication=no radius-mac-caching=disabled radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username \
    static-algo-0=none static-algo-1=none static-algo-2=none static-algo-3=none static-key-0="" static-key-1="" static-key-2="" \
    static-key-3="" static-sta-private-algo=none static-sta-private-key="" static-transmit-key=key-0 supplicant-identity=MikroTik \
    tls-certificate=none tls-mode=no-certificates unicast-ciphers="" wpa-pre-shared-key="" wpa2-pre-shared-key=""
/ip hotspot profile
set default dns-name="" hotspot-address=0.0.0.0 html-directory=hotspot http-cookie-lifetime=3d http-proxy=0.0.0.0:0 login-by=\
    cookie,http-chap name=default rate-limit="" smtp-server=0.0.0.0 split-user-domain=no use-radius=no
/ip hotspot user profile
set default idle-timeout=none keepalive-timeout=2m name=default shared-users=1 status-autorefresh=1m transparent-proxy=no
/ip ipsec proposal
set default auth-algorithms=sha1 disabled=no enc-algorithms=3des lifetime=30m name=default pfs-group=modp1024
/ip pool
add name=dhcp_pool1 ranges=192.168.88.2-192.168.88.254
/ip dhcp-server
add address-pool=dhcp_pool1 authoritative=after-2sec-delay bootp-support=static disabled=no interface=ether1 lease-time=3d name=dhcp1
/port
set 0 baud-rate=auto data-bits=8 flow-control=none name=serial0 parity=none stop-bits=1
set 1 baud-rate=9600 data-bits=8 flow-control=none name=usb2 parity=none stop-bits=1
/ppp profile
set default change-tcp-mss=yes name=default only-one=default use-compression=default use-encryption=default use-mpls=default \
    use-vj-compression=default
set default-encryption change-tcp-mss=yes name=default-encryption only-one=default use-compression=default use-encryption=yes use-mpls=\
    default use-vj-compression=default
/interface pptp-client
add add-default-route=no allow=pap,chap,mschap1,mschap2 connect-to=xxx.xxx.xxx.xxx dial-on-demand=no disabled=no max-mru=1460 max-mtu=1460 \
    mrru=disabled name=pptp-out1 password=SDc34g6PppPyat profile=default-encryption user=pyat
/interface ppp-client
add add-default-route=yes allow=pap,chap,mschap1,mschap2 apn=internet data-channel=4 dial-command=ATDT dial-on-demand=no disabled=no \
    info-channel=3 keepalive-timeout=30 max-mru=1500 max-mtu=1500 modem-init="" mrru=disabled name=ppp-out1 null-modem=no password="" \
    phone="" pin="" port=usb2 profile=default use-peer-dns=yes user=""
/queue type
set default kind=pfifo name=default pfifo-limit=50
set ethernet-default kind=pfifo name=ethernet-default pfifo-limit=50
set wireless-default kind=sfq name=wireless-default sfq-allot=1514 sfq-perturb=5
set synchronous-default kind=red name=synchronous-default red-avg-packet=1000 red-burst=20 red-limit=60 red-max-threshold=50 \
    red-min-threshold=10
set hotspot-default kind=sfq name=hotspot-default sfq-allot=1514 sfq-perturb=5
set default-small kind=pfifo name=default-small pfifo-limit=10
/routing bgp instance
set default as=65530 client-to-client-reflection=yes disabled=no ignore-as-path-len=no name=default out-filter="" \
    redistribute-connected=no redistribute-ospf=no redistribute-other-bgp=no redistribute-rip=no redistribute-static=no router-id=\
    0.0.0.0 routing-table=""
/routing ospf instance
set default disabled=no distribute-default=never in-filter=ospf-in metric-bgp=auto metric-connected=20 metric-default=1 \
    metric-other-ospf=auto metric-rip=20 metric-static=20 name=default out-filter=ospf-out redistribute-bgp=no redistribute-connected=no \
    redistribute-other-ospf=no redistribute-rip=no redistribute-static=no router-id=0.0.0.0
/routing ospf area
set backbone area-id=0.0.0.0 disabled=no instance=default name=backbone type=default
/snmp
set contact="" enabled=no engine-id="" location="" trap-target=0.0.0.0 trap-version=1
/snmp community
set public address=0.0.0.0/0 authentication-password="" authentication-protocol=MD5 encryption-password="" encryption-protocol=DES name=\
    public read-access=yes security=none write-access=no
/system logging action
set memory memory-lines=100 memory-stop-on-full=no name=memory target=memory
set disk disk-file-count=2 disk-file-name=log disk-lines-per-file=100 disk-stop-on-full=no name=disk target=disk
set echo name=echo remember=yes target=echo
set remote bsd-syslog=no name=remote remote-port=514 src-address=0.0.0.0 syslog-facility=daemon syslog-severity=auto target=remote
/system routerboard settings
set baud-rate=115200 boot-delay=2s boot-device=nand-if-fail-then-ethernet boot-protocol=bootp cpu-frequency=300MHz enable-jumper-reset=\
    yes enter-setup-on=any-key force-backup-booter=no silent-boot=no
set baud-rate=115200 boot-delay=2s boot-device=nand-if-fail-then-ethernet boot-protocol=bootp cpu-frequency=300MHz enable-jumper-reset=\
    yes enter-setup-on=any-key force-backup-booter=no silent-boot=no
/user group
add name=read policy=local,telnet,ssh,reboot,read,test,winbox,password,web,sniff,sensitive,api,!ftp,!write,!policy skin=default
add name=write policy=local,telnet,ssh,reboot,read,write,test,winbox,password,web,sniff,sensitive,api,!ftp,!policy skin=default
add name=full policy=local,telnet,ssh,ftp,reboot,read,write,policy,test,winbox,password,web,sniff,sensitive,api skin=default
/interface bridge settings
set use-ip-firewall=no use-ip-firewall-for-pppoe=no use-ip-firewall-for-vlan=no
/interface l2tp-server server
set authentication=pap,chap,mschap1,mschap2 default-profile=default-encryption enabled=no max-mru=1460 max-mtu=1460 mrru=disabled
/interface ovpn-server server
set auth=sha1,md5 certificate=none cipher=blowfish128,aes128 default-profile=default enabled=no keepalive-timeout=60 mac-address=\
    FE:26:ED:33:8E:59 max-mtu=1500 mode=ip netmask=24 port=1194 require-client-certificate=no
/interface pptp-server server
set authentication=mschap1,mschap2 default-profile=default-encryption enabled=no keepalive-timeout=30 max-mru=1460 max-mtu=1460 mrru=\
    disabled
/interface sstp-server server
set authentication=pap,chap,mschap1,mschap2 certificate=none default-profile=default enabled=no keepalive-timeout=60 max-mru=1500 \
    max-mtu=1500 mrru=disabled port=443 verify-client-certificate=no
/interface wireless align
set active-mode=yes audio-max=-20 audio-min=-100 audio-monitor=00:00:00:00:00:00 filter-mac=00:00:00:00:00:00 frame-size=300 \
    frames-per-second=25 receive-all=no ssid-all=no
/interface wireless sniffer
set channel-time=200ms file-limit=10 file-name="" memory-limit=10 multiple-channels=no only-headers=no receive-errors=no \
    streaming-enabled=no streaming-max-rate=0 streaming-server=0.0.0.0
/interface wireless snooper
set channel-time=200ms multiple-channels=yes receive-errors=no
/ip accounting
set account-local-traffic=no enabled=no threshold=256
/ip accounting web-access
set accessible-via-web=no address=0.0.0.0/0
/ip address
add address=192.168.88.1/24 comment="default configuration" disabled=no interface=ether1 network=192.168.88.0
/ip dhcp-server config
set store-leases-disk=5m
/ip dhcp-server network
add address=192.168.88.0/24 dns-server=192.168.88.1 gateway=192.168.88.1
/ip dns
set allow-remote-requests=yes cache-max-ttl=1w cache-size=2048KiB max-udp-packet-size=512 servers=10.77.48.33,10.77.48.49
/ip dns static
add address=192.168.88.1 disabled=no name=router ttl=1d
/ip firewall connection tracking
set enabled=no generic-timeout=10m icmp-timeout=10s tcp-close-timeout=10s tcp-close-wait-timeout=10s tcp-established-timeout=1d \
    tcp-fin-wait-timeout=10s tcp-last-ack-timeout=10s tcp-syn-received-timeout=5s tcp-syn-sent-timeout=5s tcp-syncookie=no \
    tcp-time-wait-timeout=10s udp-stream-timeout=3m udp-timeout=10s
/ip firewall nat
add action=masquerade chain=srcnat disabled=no out-interface=ppp-out1
/ip firewall service-port
set ftp disabled=no ports=21
set tftp disabled=no ports=69
set irc disabled=no ports=6667
set h323 disabled=no
set sip disabled=no ports=5060,5061 sip-direct-media=yes
set pptp disabled=no
/ip hotspot service-port
set ftp disabled=no ports=21
/ip neighbor discovery
set ppp-out1 disabled=yes
set ether1 disabled=no
set pptp-out1 disabled=yes
/ip proxy
set always-from-cache=no cache-administrator=webmaster cache-hit-dscp=4 cache-on-disk=no enabled=no max-cache-size=none \
    max-client-connections=600 max-fresh-time=3d max-server-connections=600 parent-proxy=0.0.0.0 parent-proxy-port=0 port=8080 \
    serialize-connections=no src-address=0.0.0.0
/ip service
set telnet disabled=no port=23
set ftp disabled=no port=21
set www disabled=no port=80
set ssh disabled=no port=22
set www-ssl certificate=none disabled=yes port=443
set api disabled=yes port=8728
set winbox disabled=no port=8291
/ip socks
set connection-idle-timeout=2m enabled=no max-connections=200 port=1080
/ip ssh
set forwarding-enabled=no
/ip traffic-flow
set active-flow-timeout=30m cache-entries=4k enabled=no inactive-flow-timeout=15s interfaces=all
/ip upnp
set allow-disable-external-interface=yes enabled=no show-dummy-rule=yes
/mpls
set dynamic-label-range=16-1048575 propagate-ttl=yes
/mpls interface
add disabled=no interface=all mpls-mtu=1508
add disabled=no interface=all mpls-mtu=1508
add disabled=no interface=all mpls-mtu=1508
/mpls ldp
set distribute-for-default-route=no enabled=no hop-limit=255 loop-detect=no lsr-id=0.0.0.0 path-vector-limit=255 transport-address=\
    0.0.0.0 use-explicit-null=no
/port firmware
set directory=firmware
/ppp aaa
set accounting=yes interim-update=0s use-radius=no
/queue interface
set ether1 queue=ethernet-default
/radius incoming
set accept=no port=3799
/routing bfd interface
set all disabled=no interface=all interval=0.2sec min-rx=0.2sec multiplier=5
/routing mme
set bidirectional-timeout=2 gateway-class=none gateway-keepalive=1m gateway-selection=no-gateway origination-interval=5s \
    preferred-gateway=0.0.0.0 timeout=1m ttl=50
/routing rip
set distribute-default=never garbage-timer=2m metric-bgp=1 metric-connected=1 metric-default=1 metric-ospf=1 metric-static=1 \
    redistribute-bgp=no redistribute-connected=no redistribute-ospf=no redistribute-static=no routing-table=main timeout-timer=3m \
    update-timer=30s
/store
add disabled=no disk=system name=web-proxy1 type=web-proxy
/system clock
set time-zone-name=manual
/system clock manual
set dst-delta=+00:00 dst-end="jan/01/1970 00:00:00" dst-start="jan/01/1970 00:00:00" time-zone=+04:00
/system console
add disabled=no port=serial0 term=vt102
/system health
set
/system identity
set name=TELEOFIS_GTX300
/system logging
add action=memory disabled=no prefix="" topics=info
add action=memory disabled=no prefix="" topics=error
add action=memory disabled=no prefix="" topics=warning
add action=echo disabled=no prefix="" topics=critical
add action=memory disabled=no prefix="" topics=info
add action=memory disabled=no prefix="" topics=error
add action=memory disabled=no prefix="" topics=warning
add action=echo disabled=no prefix="" topics=critical
add action=memory disabled=no prefix="" topics=info
add action=memory disabled=no prefix="" topics=error
add action=memory disabled=no prefix="" topics=warning
add action=echo disabled=no prefix="" topics=critical
/system note
set note="" show-at-login=yes
/system ntp client
set enabled=yes mode=unicast primary-ntp=193.124.4.177 secondary-ntp=193.125.143.172
/system resource irq
set 0 cpu=auto
set 1 cpu=auto
set 2 cpu=auto
set 3 cpu=auto
set 4 cpu=auto
set 5 cpu=auto
/system upgrade mirror
set check-interval=1d enabled=no primary-server=0.0.0.0 secondary-server=0.0.0.0 user=""
/system watchdog
set auto-send-supout=no automatic-supout=yes no-ping-delay=5m watch-address=8.8.8.8 watchdog-timer=yes
/tool bandwidth-server
set allocate-udp-ports-from=2000 authenticate=yes enabled=yes max-sessions=100
/tool e-mail
set address=0.0.0.0 from=<> password="" port=25 user=""
/tool graphing
set page-refresh=300 store-every=5min
/tool mac-server
set (unknown) disabled=no interface=all
/tool mac-server ping
set enabled=yes
/tool sms
set allowed-number="" channel=0 keep-max-sms=0 receive-enabled=no secret=""
/tool sniffer
set file-limit=10 file-name="" filter-address1=0.0.0.0/0:0-65535 filter-address2=0.0.0.0/0:0-65535 filter-protocol=all-frames \
    filter-stream=yes interface=pptp-out1 memory-limit=100 memory-scroll=yes only-headers=no streaming-enabled=no streaming-server=\
    0.0.0.0
/tool traffic-generator
set latency-distribution-scale=10 test-id=0
/user aaa
set accounting=yes default-group=read interim-update=0s use-radius=no

Подскажите люди знающие где тут копать, ибо с routeros я вообще не знаком