Can't connect to the net over DSL

eth0_

I moved into an apartment block this week, it has 4 meg ADSL and network points in every room.

We got our IP allocation etc and I bunged everything into network preferences and then....nothing!
Can't connect to anything. I can ping things on my subnet, I can ping the DNS server in the apartment blocks comms room, I can ping external hosts and it'll resolve the hostname into an IP address but then I get a load of replies saying

host is down.

I've quadruple checked my configuration settings, i've rebooted several times, and still the same problem. My Windows using flatmates have had no such problems and are online!

I had this problem before using DSL at home, and it cleared after rebooting. Is it possible my network card is faulty? I'm going to try a PRAM and NVRAM reset this evening, any other suggestions?

Hugh_C

eth0_ wrote:

Can't connect to anything. I can ping things on my subnet, I can ping the DNS server in the apartment blocks comms room, I can ping external hosts and it'll resolve the hostname into an IP address but then I get a load of replies saying

host is down.

What OS? 10.x I'm assuming.

Are you connecting using DHCP? Maybe you're getting a weird IP or summat - you can force a "Renew DHCP Lease" byt typing something arbitrary into DHCP Client ID and hitting Apply. This will cause a re-negotiation of DHCP.

I would doubt that your ethernet card has suddenly gone down since you can ping other boxen, it's never happened me during many years of Mac-dom, and about 12 machines. You could try the PRAM thing, but I doubt that's the problem. Have you tried connecting through one of the successful network connections elsewhere in the flat? Can you rule out a dodgy ethernet cable and socket? I reckon it's a DNS weirdness. You haven't been tinkering under the hood in Terminal at all, have you?

h

eth0_

It's OS X, can't remember the release but i'm 2 releases behind the current one.
No, we've been assigned static IP's, and I have the network config set to manual. I did an ifconfig in terminal and it has the right address there too.

How can it be DNS weirdness when my flatmate can get on the net with the same network point, cable, and the same network config? Sorry - should have mentioned that initially. The problem is definitely with my mac

Hugh_C

eth0_ wrote:

It's OS X, can't remember the release but i'm 2 releases behind the current one.
No, we've been assigned static IP's, and I have the network config set to manual. I did an ifconfig in terminal and it has the right address there too.

How can it be DNS weirdness when my flatmate can get on the net with the same network point, cable, and the same network config? Sorry - should have mentioned that initially. The problem is definitely with my mac

Hmm. Dunno eth0_ I'm at a loss. Nothing weird about your Ethernet setting in Network prefs? No unusual MTU settings or anything? Anything switched on in Proxies? Have you made entries into DNS servers panel? have you tried making a new user with administrative privs and see if a virgin user works? just in case there's a strange corruption in your prefs? Have you done a "repair permissions" lately? apache turned on?

Hard to know, keep us posted.

Yeah, try a few restarts too.

H

eth0_

I've done about 4 reboots last night
I'll try the new user idea, and i'm going to do an NVRAM reset (need to do this anyway to clear a speaker problem) and maybe a PRAM reset this evening too.

A Fun Friday night, then!

Dr_Teeth

Does the router have a list of MAC addresses that are allowed internet access?

Teeth.

ZENER

Hi eth0,

it sounds to me like there may be a proxy server between you and the net. You mention there's a DNS server in the block and it's resolving the IP's you're pinging into names - have you tried another DNS number for example IOLBB 192.111.39.1 or 4. For pig-iron try setting the proxy server address to be the same as the default gateway with port 80 or 8080.

Have a look at the network control panel of your housemates PC and check if there is a proxy server setting - alternatively try their i.p. address to see if that works also try a traceroute to boards.ie and post the results here.

Failing that create a new network profile on the mac and start over with the settings again.

What browsers have you tried by the way - have you got I.E (spit!!) - try it.

What about email or FTP do you get the same results ?

Good luck

ZEN

deevey

Open a terminal window and try this

killall -HUP lookupd ......... this should dump all DNS settings that are quite possibly messed up.

also try this if the above doesnt work

ipfw -f flush ..... this will should flush any crazy firewall stuff going on if its enabled.

theres a flush dns command too, cant remember it offhand though, sure google will throw up some answers though think it might be 'dns -f flush' dont quote me on it though


Steve

eth0_

Zener - nope, no proxy server.

Deevey - Thanks! Was trying to find how to flush all the settings last night, will try that when I get home!

Turns out I had my os x firewall turned on..d'oh. Turned it off...still no joy.
Another weird thing. During the course of troubleshooting this over the weekend it was suggested that I clone my MAC address to that of my housemates and see if that made any difference. But it wouldn't change the MAC address! I was logged in as root at the time, and the command executed fine, but the address never changed. Very odd?

I also did an NVRAM an PRAM reset, nothing changed at all.

eth0_

Right,
* I flushed the dns and tcp/ip settings.
* I deleted every single network connection I have and re-added the config for broadband.
* I can ssh to my internal IP (192.168.7.1) with no problems, and I can ping the other machine in our apartment, so I doubt my tcp stack is fscked, although i'm going to take my laptop to a net cafe tonight and see if I can get it working that way to be 100% sure.

This is all the network info we've been given (which works fine on my flatmates' XP machines.

IP's: 192.168.7.1-2
Subnet mask: 255.255.255.252 <--an odd subnet mask to use?
DNS: 192.168.92.2 and 192.168.92.1
Default gateway: 192.168.92.2

HELP!

deevey

How about you get a loaner of a second netowrk card for the XP machine and see if you can get connected Through it using ICS ? At least That will surely tell if its your mac thats really the prob.

You could also try re-enabling DHCP rebooting, and see what IP you get..

I have come across Imacs mainly that wont connect to the internet even though it can ping a router.. usually setting back to DHCP and a reboot, try connecting again, then you can set back to static IP.

I have a feeling that its not going to work though and theres more than one router at play here, with that subnet and gateway... also more confusing is the DNS servers you were given 192.168.92.2 and 192.168.92.1?? looks like an internal IP so maybe a proxy in place.

Have you tried running the network wizard to see if that'll create / find the correct settings ?

laters

Steve C

eth0_

Well I got it working...sort of...following a reinstall of OS X. There was nothing wrong with my networking before, I might mention, as I brought my powerbook to a net cafe and it worked fine there.

Anyway, I have HTTP and pop3 access, but no access to internet radio, msn, or ssh - ports which we asked to be unblocked for the network in our apartment. I'm using the IP I was assigned, and when I try my flatmates IP's (and they can access those ports), it still doesn't work. Odd!!

gutta

eth0_ wrote:

Anyway, I have HTTP and pop3 access, but no access to internet radio, msn, or ssh - ports which we asked to be unblocked for the network in our apartment.

how's your personal firewall set up? Any weirdnesses in there?

System prefs:Sharing:firewall - but I'm sure you're already acquainted with that...

H