Have you considered the possibility of the iptables hack? http://www.prolexic.com/knowledge-center-ddos-threat-advisory-iptables-iptablex-linux-bots-botnet-cybersecurity.html
--jrp On Fri, Sep 5, 2014 at 6:58 AM, Doug Smythies <[email protected]> wrote: > > On 2014.09.05 01:10 Kim Emax wrote: > > > I was wondering if there´s been any changed in the later kernels? > > > > I´m using a ubuntu server with tow nics as a router, firewall, DHCP etc. > > The last month out of nowhere and without any changes (other > than > regular > > updates from apt) my LAN has been fucked on upload (0.07mbit), while the > WAN > > has +40Mbit. I´ve rebooted switches and WLAN > router, changed the LAN > nic and > > has a laptop directly to the router, no luck. > > By changing in the iptables rules i´ve managed to tweak the LAN upload > to 1-2mbit, > > still works really bad on LAN though. Taking a test > at > hastighedstest.tdc.dk shows > > NO speed at first, then after a while it goes up a bit up to 3mbit, then > falls back > > and stays around > 1mbit. Wierd behaviour. > > Current Kernel: 3.2.0-67-generic, Ubuntu 12.04 > > Yes, the same thing happened to my Ubuntu 12.04 server which is my main > router to > my LAN with the same kernel. > > The lost time and frustration trying to figure it out was staggering. > I also suffered significant collateral damage. > > In my case the root issue was MTU and some new enforcement thereof, giving > a lot > ICMP packets saying something like: > "ICMP port unreachable, packet too long and don't fragment bit is set" > > O.K. so the real root issue is that some clients (windows clients and only > a > couple of NIC cards (it seems)) ignore the MTU and send larger packets. > > Anyway, and in my case, the issue is resolved in the next kernel, or by > going back to the previous kernel. > > Linux doug-64 3.2.0-68-generic #102-Ubuntu SMP Tue Aug 12 22:02:15 UTC > 2014 x86_64 x86_64 x86_64 GNU/Linux > > ... Doug > > > > -- > ubuntu-server mailing list > [email protected] > https://lists.ubuntu.com/mailman/listinfo/ubuntu-server > More info: https://wiki.ubuntu.com/ServerTeam
-- ubuntu-server mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
