newbie problem with adsl connection with microtik

RouterOS General
1

I did everything on de xdsl example but i just cant make it to work…
I can ping google.com and my workstation from the microtik router v2.8.12…
when i try to ping google from my workstation it gives me the ip but the pings time out…

thanks in advance…

2

More detail required. e.g. Are you using a single IP address with NAT?

3

yes I am,I am using a adsl modem connection connected to a ether card on the mk box, I already got that working, now i can ping from my workstation but im having trouble with displaying web pages and using messenger…what do you think im doing wrong?

thanks..

4

It looks like the problem lies in one of 2 areas.

  1. Do you have a source nat rule setup to masquerade your internal IP addresses? Will look something like:

[admin@Net4501] ip firewall src-nat> pr
Flags: X - disabled, I - invalid, D - dynamic
0 src-address=192.168.1.0/24 out-interface=Internet action=masquerade

2: Do you have a default route on the PC specifying the router as the gateway?

Regards

Andrew

5

  1. i do have the firewall rule like this…
    ip firewall src-nat>print
    0 src-address=200.200.200.0/24 out-interface=pppoe-out1 action=masquerade

  2. i have the gateway setup to be the mk box on my workstation, i can ping from my workstation to the internet and there is response, but i cant see web pages or use msn messenger..when i try to see a web page it just stays still…

thanks…

6

i started from scratch, and now i can see certain web pages from my workstation like google.com and cnn.com …i still cant use msn messenger… what else do you think im doing wrong…??

thanks…

7

Are you saying that web browsing is working OK now?

Messenger uses a whole load of stuff that has problems with NAT and firewalls, mostly the audio and video stuff. MS has some articles on it’s support site dealing with this. None of this will stop you just logging on though.

Make sure you have reliable responses to DNS requests as this can really spoil your day if it’s unreliable.

Regards

Andrew

8

Enable UPnP, perhaps…

9

i enabled upnp but without luck, i can browse a few web pages like cnn.com or google.com but i cant browse yahoo.com i can ping to it but i cant browse it, on my firewall the only rule i have set up is the masquerade rule, dns response are in the 30 ms and no loss…
im beggining to think that the web and messenger problem may be related but i dont know…

any other suggestions are really apreciated…

thanks…

10

If you can ping yahoo.com then you have basic IP connectivity. You then need to start examining what’s happening further up the stack, e.g. what sort of proxying is between you and the outside world.

Regards

Andrew

11

Looks like MTU problem for me…

12

you mean like a transparent proxy?

13

Good point. I always forget about MTU.

Regards

Andrew

14

that was it! i now got that working i didnt know that it was that important, i mean i have a adsl router and i never had problems with that…

thanks alot for all the help…