Hi
On my router:
Tomato v1.28.0000 MIPSR2-2.4-123 K26 USB AIO
========================================================
Welcome to the Netgear WNR3500L v2 [TomatoUSB]
# uname -a
Linux unknown 2.6.22.19 #4 Wed Oct 29 11:33:28 CET 2014 mips GNU/Linux
got problem with DDoS attack. From time to time - usually every day between 6 p.m. - 01:00 a.m. - somebody is attacking. I`m not sure he is attacking from only one IP address or many.
I got no proper rules for my iptables and i`m not sure exacly how to defend from this kind of attack.
I think this kind of attack is not on TCP but UDP protocol. Why? becouse i think somebody is trying to DDoS my TeamSpeak v3 server behind that router. If TeamSpeak is turned off - there are not DDoS attack at all, my router is alive and not under heavy traffic.
Using iptables && conntrack got a problem, becouse my iptables rules are not accepted becouse i got no conntrack :
# iptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP
iptables v1.3.8: Couldn't load match `conntrack':File not found
Try `iptables -h' or 'iptables --help' for more information.
That is weird becouse i think i got it:
# lsmod | grep conntrack
nf_conntrack_h323 37152 0
nf_conntrack_ipv6 14176 3
# modprobe -l | grep conntrack
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_h323.ko
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_proto_gre.ko
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_sip.ko
/lib/modules/2.6.22.19/kernel/net/ipv6/netfilter/nf_conntrack_ipv6.ko
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_ftp.ko
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_pptp.ko
/lib/modules/2.6.22.19/kernel/net/netfilter/nf_conntrack_rtsp.ko
So if i got it - i dont know how to load this module for IPv4.
# ll -a /lib/modules/2.6.22.19/kernel/net/ipv4/
drwxr-xr-x 3 root root 191 Oct 29 2014 ./
drwxr-xr-x 9 root root 105 Oct 29 2014 ../
-rw-r--r-- 1 root root 7704 Oct 29 2014 ah4.ko
-rw-r--r-- 1 root root 9288 Oct 29 2014 esp4.ko
-rw-r--r-- 1 root root 9160 Oct 29 2014 ipcomp.ko
drwxr-xr-x 2 root root 593 Oct 29 2014 netfilter/
-rw-r--r-- 1 root root 5344 Oct 29 2014 tcp_vegas.ko
-rw-r--r-- 1 root root 5176 Oct 29 2014 tunnel4.ko
-rw-r--r-- 1 root root 3284 Oct 29 2014 xfrm4_mode_beet.ko
-rw-r--r-- 1 root root 2388 Oct 29 2014 xfrm4_mode_transport.ko
-rw-r--r-- 1 root root 3292 Oct 29 2014 xfrm4_mode_tunnel.ko
-rw-r--r-- 1 root root 3956 Oct 29 2014 xfrm4_tunnel.ko
modprobe -a /lib/modules/2.6.22.19/kernel/net/ipv4/
So my question is how to load conntrack ipv4 to get iptables working with it for udp?
How to set proper rulez for droppig udp traffic by iptables? Right know i got about 50 tcp rules, but i need successful working udp.
How to configure my router to defend that DDoS? Is it even possible?
Edytowany przez kille72 dnia 17-10-2017 18:46
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