All Questions
21
questions
1
vote
2
answers
4k
views
Client isolation in Ubuntu with hostapd
We have created a wifi hotspot or a wireless access point using hostapd in Ubuntu. How can we isolate wifi clients the same way "Client Isolation" does in some access points? Is there any way we can ...
- 111
0
votes
1
answer
1k
views
VPN server on ubuntu enabling NAT problem! please help
Hi I am trying to Create a vpn server on a vps which is running ubuntu percise 12.04. I have already installed pptpd and I have enabled ip forwarding but when I try to enable NAT with this command :
...
4
votes
2
answers
3k
views
Restricting Internet access of some LAN clients to a few websites using an Ubuntu gateway
How should I limit the Internet access of most systems on my LAN to a few websites and block all the other websites? I would also like to bypass those restrictions for some systems. All systems have ...
- 403
1
vote
1
answer
3k
views
Why is iptables getting double rules?
I have a server running Ubuntu 12.04.
A couple of reboots back I started noticing that iptables rules get doubled upon reboot.
This is what I get after a reboot (with added line breaks):
$ sudo ...
- 866
0
votes
3
answers
15k
views
How do I write an iptables rule to limit Internet bandwidth usage of user or IP address
How do I control or limit Internet bandwidth usage of users/computer/IP address in network with the help of iptables rules?
I have one static IP address which provides Internet (that is, WAN). I ...
0
votes
1
answer
325
views
keep getting added to hosts.deny + iptables
I am confused to why this has started to happen. On my local network, if I click 10-20 apache/http links my server will decide to add me hosts.deny file and block me on iptables.
Its not just apache,...
- 99
0
votes
1
answer
3k
views
How to open the ports on firewall in Ubuntu? [duplicate]
I'm pretty new to Ubuntu. I just want to open the most common ports namely
FTP (port 20 TCP/UDP)
HTTP (port 80 TCP/UDP)
SMTP (port 25 TCP)
ETC
I've tried all the ways in iptables, ufw, and gufw.
In ...
- 109
3
votes
1
answer
17k
views
what does this mean "80/tcp filtered http"
Our linux server(ubuntu) stop listing on port 80. this is what i got :
PORT STATE SERVICE
22/tcp open ssh
80/tcp filtered http
what does this "80/tcp filtered http" means?
What ...
- 131
1
vote
1
answer
456
views
Ubuntu 12.04 secondary IP externally inaccesible
I have added a secondary IP to my virtual server, Ubuntu 12.04 running in OpenVZ virtual host. I used ip addr add xx.xxx.168.95/32 label venet0:1 dev venet0.
When I do ifconfig the IP shows up below ...
- 117
1
vote
1
answer
555
views
Outbound SMTP redirect
How would I go about redirecting all outbound email on port 25 of my server to port 25 on another server using iptables. I have tried a few rules already and none of them are working.
Would ...
- 111
0
votes
0
answers
75
views
Port won't open! [duplicate]
I have a server that want to allow connections into it through port 25565, but when I test on http://www.yougetsignal.com/tools/open-ports/ it says they are closed?
I have no outfacing interface ...
- 815
26
votes
4
answers
31k
views
persist port routing from 80 to 8080
I use amazon EC2 instance which works via ubuntu. By default according security restrictions I can't bin my application to port 80, so I just bind it port 8080 and then set routing redirect from port ...
- 405
0
votes
1
answer
1k
views
UFW locks me out of server everytime I run it
Background: I'm setting up a new 12.04 instance on a VPS with a new provider.The VPS provider only offers a 32bit image but that really shouldn't matter here. I have no local access to the machine and ...
- 141
1
vote
2
answers
5k
views
Block ping from a particular IP address
My server is Ubuntu 12.04:-> IP 192.168.56.100 I have a client Ubuntu 13.04:-> IP 192.168.56.101
I have to block the ping from client to server
So I wrote the IPTABLE rule.
iptables -A INPUT -i eth0 ...
- 601
9
votes
2
answers
2k
views
How to disable NAT for IPv6 (NAT66)?
The current Ubuntu LTS does not support NAT tables for IPv6 (i.e. there is no ip6tables -t nat), and I'm fine with that, in fact, a NAT-less environment is the "core" of my networks.
But, the next ...
- 829
1
vote
1
answer
2k
views
How ca I enable port to be accessible on public ip
I have Ubuntu server I am trying to the port 8550 to be accessible on the server public IP address, I can hit the web service running on that port from the server itself but not from the public IP ...
- 667
8
votes
1
answer
50k
views
Where are iptables's rulesets stored on Ubuntu 12.04?
Ubuntu 12.04 LTS - iptables v1.4.12
TLDR:
Where are iptables's rulesets saved when invoking iptables-save <ruleset-name> ?
Explanation:
According to this answer basic way of saving iptables'...
- 415
3
votes
2
answers
14k
views
UFW 'default deny incoming' doesn't work
I have UFW enabled, 'default deny incoming' set and no any additional rules, but I still can access all ports from other PCs.
I have to manually block each port. What can be wrong?
- 31
4
votes
0
answers
5k
views
Webmin Port Forwarding
I have not been able to figure this out at all.
I have 1 Lan IP address and 5 external static IPs:
eth0: 10.0.0.1 - internal lan ip and router IP.
eth1: xx.xx.xx.217 - external
eth2: xx.xx.xx.218 - ...
2
votes
2
answers
738
views
cannot establish TCP connection with VPS
Vince Stewart
I have a VPS on Ubuntu 12 and a home computer on Ubuntu 12. I have a Java application on the VPS which opens a tcp socket listening on port 4000 and also an Http listener. My ssh service ...
2
votes
5
answers
6k
views
How do I prevent iptables from loading on boot?
I don't need iptables on my computer, since I'm behind a NAT Server and a router. I, therefore, flushed all the rules I had left to disactivate the firewall. I wonder if I could probably prevent ...
- 605