Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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Hello,
I seem to have developed network problem with one of my boxes. After a reboot yesterday I started having troubles connecting to it through the network. I experimented to try and find where the problem lay but all I can think of is a loopback problem. Here is what I tested:
1. The box can ping other sites in the big wide world as well as on the LAN.
2. The box cannot ping either its own IP address or is loopback address
3. I am not able to ping or connect (ssh etc.) to the box from another machine.
I have emptied all the rules from iptables and set all the defaults to allow, so it should not be a firewall problem. The only other thing I can think of is that it is a faulty network card, but this seems unlikely because some things work ok, and the NIC isn't concerned with the protocol either. But just to be safe, I moved the NIC away from the (old) graphics card.
BTW. The NIC is a Netgear
I may have also had the problem a while back when the machine was running a install of RH8. I say "may", because I was at Uni (box was at home) then and all I knew was that I couldn’t connect to the machine for long random periods (and nor could any other machine on the LAN).
Many thanks for any help!
Radam
PS. Oh, and i'm running Mandrake 10.0 Official. And before the fateful restart i installed sendmail, but that is now removed and the problem is still there.
Thanks. I have given all of those a go and it does not seem to have helped. I also noticed that my /etc/hosts.deny file contains the single line (+ comments):
ALL:ALL EXCEPT 127.0.0.1ENY
I dont realy know how this file is layed out, but is this denying the loopback interface? Just a guess. I have never looked at this file before so I do now know if this is odd.
Hi,
I tried that and it doesn't seem to have helped :-(
I commented out the line in my hosts.deny file, rebooted and still had the same problem. I'm struggling to see what the problem is here, if anyone could point me in the right direction that would be great.
It seems to be working now. Im guessing commenting that line helped. I checked on my other linux box and that line was not present. (Also, I must admit that I had not started sshd, which made connecting to it a little difficult!)
I dont know why that line was added to my hosts.deny file, its still a mystery. Actually, i still don't really know what the line means, if someone could tell me that would be great.
Thanks again
Radam
PS. I still cannot ping the loopback address, but I can make other connections on it. Considering that there is no firewall, isnt this a bit odd? Or could this be because the security level is set to "Higher"?
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