All Questions
16
questions
0
votes
0
answers
14
views
Firewall to white- or black-list incoming requests
Well over a decade ago, when I was a Windows user, I used a Kaspersky firewall that would pop up when an application wanted was receiving a connection and allow me to allow or deny such connections.
...
- 2,821
1
vote
0
answers
853
views
How to disallow connection by ip country except one?
I want to disallow incoming connection from all country except one.
I know https://www.ip2location.com/free/visitor-blocker and what files I have to download and allow and select 1 country.
Then how ...
- 11
1
vote
1
answer
3k
views
Ubuntu server behind a firewall
I have a problem regarding a server behind a firewall, essentially, the whole internet is blocked, and I can't use the "add-apt-repository", problems like "X user or team does not exist&...
- 13
0
votes
0
answers
140
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iptable rules to allow downloading stuff while default policy is on DROP
I was trying to install bind and for some reason I was getting issues most likely due to my iptable rules , I can ping google.ca anybody have any reccomndations down below are my current rulesets
...
- 1
1
vote
1
answer
7k
views
IP forwarding does not work
I have 2 Ubuntu systems , both have Ubuntu 20.04, one has server (5.4.0-42-generic) , the other has desktop (5.4.0-58-generic).
I can get ip forwarding working on one system which has the server .
But ...
2
votes
0
answers
815
views
I can't access port externally. What can I do?
(Ubuntu 20.04)
I have ufw disabled, and I can't seem to access my game server externally with the public IP and port (1848). I can however, connect locally, just not externally.
When I run: netstat -...
- 103
0
votes
0
answers
170
views
Can a firewall filter ip addresses?
The Linux firewall can filter ports but can it also block ip addresses from securing a connection?
- 29
1
vote
1
answer
2k
views
Configuration of ufw for one user. Noob
I have several sudo users on Ubuntu 16 PC. ufw is disabled on this PC now. I need to switch ufw on for sudouser1. I need to make following config:
1) allow all and any incoming and outgoing ...
- 229
0
votes
2
answers
1k
views
How can I allow the IP range xxx.xx.xxx.x/yy
I want to whitelist the IP range xxx.xx.xxx.x/yy with iptables. I have already tested many variants without success, like:
iptables -A INPUT -s xxx.xx.xxx.x/yy -j ACCEPT
iptables -A INPUT -i eth0 -s ...
user737215
1
vote
1
answer
109
views
How can I dynamically determine the IP mask to use for dynamic ranges?
I have a list of ranges for IP addresses that I want to block, the ranges are like 210.80.32.0 to 210.80.63.255
How can I dynamically determine the right 210.80.32.0/NUMBER to capture the full range? ...
- 13
0
votes
1
answer
2k
views
Can't ping my IP address
I cant ping my own IP address for my machine running Ubuntu. I have tried to ping the machine with an external VPS but I still have had no luck. I have opened port 80 (TCP) even though I don't think ...
- 103
1
vote
0
answers
1k
views
Why can't I connect to my localhost port from a remote computer?
I'm using link-grammar server to convert sentences into semantic graphs. It provides an API though a port to do the above process. It's configured to works through port 9000 of localhost. I used to ...
7
votes
1
answer
32k
views
Whitelist IPs for ufw
I have set some rules in ufw to rate limit connections, as such:
-A ufw-user-input -p tcp --dport 25 -m state --state NEW -m recent --set
-A ufw-user-input -p tcp --dport 25 -m state --state NEW -m ...
- 2,821
2
votes
0
answers
182
views
found someone lurking in my LAN, not sure what to do next
I have DD WRT router with internal numbers all falling within 192.168.1.0/24. I was looking on my firewall records this morning and found someone at 10.10.109.100 got blocked from accessing port 5353 ...
- 2,319
1
vote
1
answer
935
views
User to access only to specific IP addresses
How can I setup Ubuntu box so logged user can access only to several IP addresses, on all protocols?
Additional problem is that Ubuntu uses proxy to acceess to internet.
Tried with UFW, but did not ...
- 209
12
votes
2
answers
34k
views
Port listening on localhost:8000 but not on ip:8000
Hello I'm running a web application on port 8000. When I access it from the host server localhost:8000 it responds ok, 127.0.0.1:8000 also works, but 192.168.1.7:8000 does not work. 192.168.1.7 is the ...
- 129