A Firewall is an application or hardware device used to inspect and filter network traffic.

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2answers
35 views

Is there a way to block ALL inbound/outbound traffic going outside of a LAN with iptables?

As the title says, I'm just looking for a way to disallow any traffic on ANY port unless it's going to a local IP address (192.168.1.*).
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votes
1answer
70 views

How to allow google-analytics via iptables when internet is blocked for other traffic [duplicate]

I am running the following script on a wifi gateway. The WAN side of the gateway has ppp0 interface while LAN side is on wlan0. No LAN user should be allowed to browser internet Some services on ...
0
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0answers
26 views

pfSense WAN load balancing across two IPs (has single gateway)

My virtual setup has two IPs, but they rely on the same gateway. I had this configured: interface - type - IP address - Gateway em0 - WAN1 - 172.16.155.131 - 172.16.155.2 em1 - LAN ...
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votes
1answer
22 views

SSH port blocked EC2

I had installed Tomcat on my EC2 instance . However i was unable to access it using my public IP:8080 . So I followed the instructions mentioned in the post ...
0
votes
1answer
304 views

MikroTik - can't access webfig from external / can't SSH into router from external ip

Ok, here's the deal. Let's say that my public facing IP is 10.0.01. I can't webfig into 10.0.01 from external and can't SSH into mikrotik router from external IP. I can do it if I am physically ...
0
votes
0answers
31 views

Ip6tables firewall make server unreachable on reboot

I am trying to set up a very basic firewall on my server with iptables and ip6tables. My rules get loaded on restart with systemD. The OS is ArchLinux. When I just setup iptables everything works. ...
2
votes
1answer
68 views

Need recommendations on Firewalled DMZ design for PHP web server on Linux

The 3 options we are considering are listed below. Which one is best or is there a better solution we didn't consider. All servers are linux with nginx. Do you see anything particularly wrong with ...
0
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0answers
27 views

Allow URL:Port in Forefront TMG

I have Forefront TMG 2010 installed as a Proxy server to limit internet access to users. I usually have the following issues: 1- I can't configure Email clients (Outlook) with URLs of POP/IMAP and ...
1
vote
2answers
30 views

Is it possible to limit which hosts are accessible through SSH tunneling?

I have a box that runs both an ssh server and a webserver. I would like to prevent people with ssh accounts from using this box as an anonymous proxy to the rest of the Internet (e.g. by creating a ...
1
vote
1answer
42 views

Benefits of separate firewall product over AWS Security Groups for spam requests

I have a question that is an extension of this one: Examples where an AWS Security Group is not sufficient as a firewall?. Initially, the answer in that question made sense to me and I was working ...
-1
votes
1answer
33 views

Firewall throughput [closed]

I saw on multiple site vendor sites about firewall throughput in 1518/512/64 bytes UDP packet and each result from 1518/512/64 bytes UDP packet is 1xxx/smaler than 1xxx/significantly smaller than ...
0
votes
1answer
12 views

How to block or forward packets with custom and dynamic rules

I would like to block or forward TCP requests from clients to WAN according to source and destination ip addresses. The problem is that this ip couples are stored in a mysql database and they can ...
-1
votes
1answer
51 views

Find source(s) of dropped packages in Cisco ASA GUI

we are using pair of ASA 5520 Firewalls with ASDM 6.4. Can someone enlighten me, how to find out which is(are) the source or target ip(s) when we got a hugh bunch of dropped packages come in (by ASDM ...
0
votes
1answer
34 views

How to disable network access for a user on Linux?

Trying to disable the network access for the user: [root@notebook ~]# iptables -I OUTPUT -m owner --uid-owner tempuser -j DROP [root@notebook ~]# ip6tables -I OUTPUT -m owner --uid-owner tempuser -j ...
0
votes
0answers
33 views

Can't Remote Desktop on LAN, Firewall Rules in Place, Yet Packets Dropped

I've banged my head for a few hours on this. I'm beginning to move several computers to a new subnet, all Windows 7, all domain joined. On the original subnet (192.168.145.X) everything works as ...
0
votes
1answer
66 views

Large number of ssh login attempts [duplicate]

I logged into a CentOS box today to find the following" There were 11126 failed login attempts since the last successful login. Last login: Tue Mar 10 14:36:47 2015 from X.X.X.X Thats 11 THOUSAND ...
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votes
1answer
33 views

DNS ATTACK \/ or some kind of an error, i don't know

I am getting those errors in my CSF firewall, I would like to know how can I stop it. is it type of an attack? also if it is, how can I stop it? Mar 11 22:48:57 root named[7598]: client ...
1
vote
0answers
22 views

Stop Outbound SYN Scan

Hello I run a VPN company, and recently my host has been sending me these complaints that are likely coming from a user. I am not sure how to identify the user, if I could just do that I wouldn't ...
0
votes
1answer
28 views

ssh port is different from what is connected

Ok, so here's the deal. I setup an Iptables rule as follows: IPTABLES -A INPUT -p tcp --dport 51722 -j ACCEPT and if I do systemctl status sshd.service, I get the following: Server listening on ...
0
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0answers
52 views

Can't connect Windows Azure VM with MySQL On-premise

I have a VM on Windows Azure with Windows 2008 R2, and I'm trying to open a connection to an on-premise MySQL database hosted on another network. We cleared the VM's public IP (the one displayed on ...
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votes
1answer
25 views

Connecting SMTP externally

I have got a local smtp server to relay to Google smtp so as to increase the limit of email recipient from 2,000 a day to 10,000 a day for specific users. I can send through this local smtp ...
0
votes
0answers
11 views

What is “application-aware” in the context of vShield?

Reading vShield's overview, it is defined as "a hypervisor-based application-aware firewall solution for virtual datacenters". In my limited exposure to the world of firewalls, an "application-aware" ...
0
votes
1answer
108 views

I cannot connect to OpenSSH server running on Ubuntu server from Git bash running Windows, through Cyberoam firewall in network

Situation: I am trying to connect from OpenSSH client inbuilt with Git Bash running on Windows 7 professional x64 to OpenSSH server that runs on Ubuntu Server LTS 14 x64. Both of which are over the ...
0
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0answers
20 views

outlook doing remote portscanning

A while ago I switched my mailbox on another domain and configured outlook with an exchange server on that domain. Recently for some strange reason my hosting provider has been complaining that ...
0
votes
1answer
28 views

PSAD IPTables logging error

I installed PSAD on my Ubuntu server and then set the IPTables accordingly. But I still get this error by email: You may just need to add a default logging rule to the /sbin/iptables 'filter' ...
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votes
1answer
50 views

remote firewall configuration on centos7

I'm using Centos 7 and am trying to configure my firewall remotely. When I run firewall-config & a window comes up but remains blank. I cannot kill the window with the X close button so I need to ...
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votes
2answers
138 views

iptables: open port 25 CentOS 7 [closed]

I have problems opening port 25 for sendmail on my CentOS 7 machine. Here's my iptables configuration: *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state ...
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votes
1answer
21 views

Simple to use VPN Firewall [closed]

In my company we use a Cisco ASA 5505 Router with the VPN, Firewall setup, and we route IP and VOIP traffic through it. I can only log into the router from a single computer due to the quirkiness of ...
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votes
2answers
41 views

How can I enable protocol traffic with firewalld?

I need to allow Protocol 50 (esp) traffic for ipsec. I can do: iptables -A INPUT -p esp iptables -A OUTPUT -p esp How could I do this with firewalld instead? Same question closed on StackOverflow ...
4
votes
4answers
1k views

Is there a way to see what is actually filtering TCP port communication?

nmap -p 7000-7020 10.1.1.1 Will output all the filtered ports Starting Nmap 6.40 ( http://nmap.org ) at 2015-03-04 12:18 EET Nmap scan report for 10.1.1.1 Host is up (0.00091s latency). PORT ...
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votes
1answer
28 views

web application audit task require my remote IP to be allowed on application network firewall [closed]

I want to audit a web application which is hosted on a web server sitting behind a cyberoam firewall. My task is to run a scan from my remote machine which has ISP MTNL broadband. My machine gets a ...
1
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0answers
25 views

Windows Server spamming devices on other subnets on port 445

I have a Windows Server 2012 that every few seconds sends packets destined for port 445 on local IPs on other subnets. The IPs on other subnets it is trying to reach are devices such as VoIP phones, ...
1
vote
0answers
60 views

Fortigate 60D - Empty log and report

Environment: Fortigate 60D Forti OS 5.0 I can not see any log or report in the firewall. I have already activated forticloud and I recieve empty reports. Is there something that we have to ...
0
votes
1answer
61 views

How do I open specific ports on Linux (an AWS instance of RHEL v. 7)?

I'm using RedHat version 7. My AWS instances are in a security group with ample permissions for inbound connectivity. I can do Yum updates. The servers can ping each other. I can transfer files ...
-3
votes
1answer
62 views

iptables rules for blocking specific packets [closed]

Im using the following iptables rule: iptables -A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH,ACK -m length --length 52 -m state --state ESTABLISHED -j DROP It does it's job for blocking the ...
0
votes
1answer
46 views

Setup fail2ban with apf

Along with BFD we have recently installed fail2ban on our server, it is CentOS and it uses APF to block IPs. I have hunted online on how to get the two to work however when an IP is blocked by ...
0
votes
1answer
43 views

Why the firewall seems to work intermittently?

I've this iptables rules on first server which has the role of a client connecting to a second mysql server through LAN adapter. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT ...
1
vote
1answer
68 views

Linux - show dropped packets form firewall

I am trying to set up a sip trunk and so far everything has gone well. The only issue I face is that the call does is not received when the iptables service is running. By stopping the service ...
1
vote
1answer
47 views

Any idea why SFTP works differently based on the client machine/network

I have an odd situation. From Computer A with PSFTP.EXE (putty sftp client) I can connect to a remote sftp server and use dir and chdir to browse around. If I try to get or put files I get a ...
0
votes
0answers
24 views

Re-routing packets back inside the network on a SonicWall firewall

I have two wireless networks, one guest network which uses a 10.0.0.0 network to assign IP address to guests and one internal one who gets the IP address from the internal DHCP (let's say ...
0
votes
1answer
45 views

What firewall configuration do I need for SFTP to be able to put files on a remote server

I have a situation in production where SFTP (using Putty PSFTP) is working when I connect and list files on a remote server but put and get fail with error permission denied. In my dev environment I ...
0
votes
0answers
32 views

How to manage overload of ICMP with PF?

I would like to make a basic managment of ICMP overload with packet filter on FreeBSD. The function I would like to realise is:     if target receive too many ICMP from a given source IP address,   ...
0
votes
1answer
139 views

iptables v1.4.21: Couldn't load match `-d':No such file or directory

i am running kerenl 3.14.18 and using iptables 1.4.21, built with these options --static-enable --disable-shared. when i run this command: /sbin/iptables -A PREROUTING -m -d 127.3.0.2/24 -j DNAT ...
0
votes
0answers
9 views

Ganglia server in Google Cloud

Fairly new to the google platform. I needed to open up port 8649 for a ganglia server environment. When I modified the default network and added the port it shows that tcp:8649 is opened. I'm able to ...
0
votes
0answers
24 views

Temporary IPTable Rules when Process Runs

Struggling to find the solution for this and maybe it's easier than I'm making it out to be. I need to open ports in the firewall when a process runs. That process could be requesting the usage of a ...
0
votes
0answers
78 views

Forwarding traffic between interfaces inside a docker container

I have created a docker container executing the following command docker run -it --net=none --cap-add=NET_ADMIN --name firewall ubuntu /bin/bash after I have attached it two interfaces eth0 and ...
0
votes
1answer
64 views

How to allow only subnet for port with iptables

What i am trying to do is to DROP any packets to specific UDP port, except those one from my secured subnet 10.8.0.0/24. iptables -t nat -A --src 10.8.0.0/24 -p udp --destination-port 63210 -j ACCEPT ...
-1
votes
1answer
137 views

Setting up pfsense on a small business network for firewall use

I have approximately 20 machines that will all be on the same subnet with a pfsense firewall. I have no experience with pfsense, so I am just starting out. I have the following configuration: The ...
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votes
1answer
32 views

IP address detection through firewall [closed]

Suppose my computer connections are filtered by a firewall on which I have no information and no control. Will the administrators of the network will know which websites I did visit thanks to their ...
0
votes
2answers
58 views

Individuals able to hit our bandwidth cap… Only a recent phenomenon?

We have a 10Mbps (synchronous) connection with our ISP. Recently we have discovered that if a single user is watching Netflix, or if I run Windows Update on a PC, we will totally saturate that 10Mbps ...