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Is there a rule for iptables to limit the amount of SYN packets a /24 range of IPs can send?view story

http://askubuntu.com – How can I block entire C class IP blocks when they send too many SYN packets to my ubuntu 12.04 server? Example of what I see during a SYN flood attack: Each different IP only sends 1 SYN packet, so the firewall doesn't block it. But the range 192.132.209.* all together is sending a lot of SYN packets in a very small time period. (HowTos)

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Why can I reach a different interface's IP address?view story

http://unix.stackexchange.com – I'm wondering about this, and I can't seem to find an explanation on the internet. I have a linux gateway which has multiple interfaces: eth0: external ip eth1: 172.16.1.1/24 eth2: 172.16.2.1/24 ip_forward is enabled. IPtables is configured to NAT traffic from eth1 -> eth0 and eth2 -> eth0. (HowTos)

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ConfigServer Firewall 5.72 Officially Releasedview story

http://news.softpedia.com – ConfigServer Firewall, an SPI iptables firewall that is straight-forward, easy and flexible to configure and secure with extra checks to ensure smooth operation, is now at version 5.72.Highlights of ConfigServer Firewall 5.72:• Missing DD setting in DA and generic installations for ST_DISKW have been added;• IPv6 port settings have been modified to reflect IPv4 port settings for new inst (General)

7
Why can I not access imgur.com and gravatar.com from Ubuntu but can do so from Windows?view story

http://askubuntu.com – I have this strange problem, I am unable to access imgur.com from Ubuntu ! I have checked the /etc/hosts file, there seems to no entry related to imgur. I can access it from Windows(same connection). I cannot ping it or traceroute it, I cannot even ping the IP of imgur. I have cleared iptables too, what could be the cause ? i cannot access gravatar.com too !! (HowTos)

7
incoming ACCEPT all iptables rule still appearingview story

http://unix.stackexchange.com – I'm following this guide here: http://isalazyadmin.net/2009/07/02/configuring-a-basic-firewall-for-debi... And I have the iptables listed shown, but my server still appears to be accepting all incoming connections (ie: bittorrent peers are still connecting, even though I didn't allow those ports). /etc/iptables.rules *filter # This will allow all loopback (lo0) traffic and drop all traff (HowTos)

7
iptables shows Usage: /sbin/modprobe-bin [closed]view story

http://stackoverflow.com – After I execute iptables, it shows Usage: /sbin/modprobe-bin [-v] [-V] [-C config-file] [-n] [-i] [-q] [-o <modname /sbin/modprobe-bin -r [-n] [-i] [-v] <modulename> ... /sbin/modprobe-bin -l -t <dirname> [ -a <modulename> ...] Usage: /sbin/modprobe-bin [-v] [-V] [-C config-file] [-n] [-i] [-q] [-o <modname /sbin/modprobe-bin -r [-n] [-i] [-v] <modulename> ... Afte (HowTos)

7
One host unavailable over (Open)VPNview story

http://serverfault.com – I have an interesting issue with OpenVPN Ubuntu 12.04. I've been running an OPenVPN box for some time now. (HowTos)

5
Have iptables send an email on DROPview story

http://serverfault.com – I'd like to invoke sending an e-mail (or running a particular script, if that would be possible) when a certain iptables DROP rule is being run. (For instance, when I'm blocking an IP after 5 failed SSH logins, I'd like to run mail -s "SSH Blocked" [email protected] or something similar. Is there a way to directly have iptables execute this? (HowTos)

5
Can IP tables allow specific DNS queries based on domain name?view story

http://serverfault.com – I have iptables blocking all UDP traffic at the moment, however I want to allow only certain DNS queries to get through. Let's use google.com as an example. I am trying to use string matching to find the domain name in the request, and allow it. (HowTos)

5
How to use iptables on linux make PHP outgoing connections through a proxy?view story

http://serverfault.com – I write a web based proxy by PHP+curl, on my network some site need through proxy, if I use the CURLOPT_PROXY setting, it has some redirects, so will return 302 error, if add CURLOPT_FOLLOWLOCATION to 1, the windows will jump to other, so can't show in my ifream, is there someway to set iptables make php outgoing connections through proxy? (HowTos)