Author Topic: How can I config IPTABLES for DDOS aatacks?  (Read 156 times)

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How can I config IPTABLES for DDOS aatacks?
« on: July 26, 2018, 10:29:37 AM »
Hello
Here
https://javapipe.com/ddos/blog/iptables-ddos-protection/
it says to put this code :



Code: [Select]
kernel.printk = 4 4 1 7
kernel.panic = 10
kernel.sysrq = 0
kernel.shmmax = 4294967296
kernel.shmall = 4194304
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
vm.swappiness = 20
vm.dirty_ratio = 80
vm.dirty_background_ratio = 5
fs.file-max = 2097152
net.core.netdev_max_backlog = 262144
net.core.rmem_default = 31457280
net.core.rmem_max = 67108864
net.core.wmem_default = 31457280
net.core.wmem_max = 67108864
net.core.somaxconn = 65535
net.core.optmem_max = 25165824
net.ipv4.neigh.default.gc_thresh1 = 4096
net.ipv4.neigh.default.gc_thresh2 = 8192
net.ipv4.neigh.default.gc_thresh3 = 16384
net.ipv4.neigh.default.gc_interval = 5
net.ipv4.neigh.default.gc_stale_time = 120
net.netfilter.nf_conntrack_max = 10000000
net.netfilter.nf_conntrack_tcp_loose = 0
net.netfilter.nf_conntrack_tcp_timeout_established = 1800
net.netfilter.nf_conntrack_tcp_timeout_close = 10
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 10
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 20
net.netfilter.nf_conntrack_tcp_timeout_last_ack = 20
net.netfilter.nf_conntrack_tcp_timeout_syn_recv = 20
net.netfilter.nf_conntrack_tcp_timeout_syn_sent = 20
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 10
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.ip_no_pmtu_disc = 1
net.ipv4.route.flush = 1
net.ipv4.route.max_size = 8048576
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.tcp_congestion_control = htcp
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.udp_rmem_min = 16384
net.ipv4.tcp_wmem = 4096 87380 33554432
net.ipv4.udp_wmem_min = 16384
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 400000
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_intvl = 60
net.ipv4.tcp_keepalive_probes = 10
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.rp_filter = 1









in your /etc/sysctl.conf file and apply the settings with sysctl -p.

I go to /etc/sysctl.conf  it says:
"Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5)."

What can I do?
Can I add the code to /etc/sysctl.conf  directly or have to breate a new file ?
What does " apply the settings with sysctl -p" mean?


Thanks
I love CWP

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Re: How can I config IPTABLES for DDOS aatacks?
« Reply #1 on: July 26, 2018, 10:54:11 AM »
all depends on the ddos type as some can be blocked on the server and some can't...each attack is different and there are many types....
VPS & Dedicated server provider with included FREE Managed support for CWP.
http://www.studio4host.com/

*** Don't allow that your server or website is down, choose hosting provider with included expert managed support for your CWP.

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Re: How can I config IPTABLES for DDOS aatacks?
« Reply #2 on: July 26, 2018, 10:58:16 AM »
How can find the type?
They hammer index,php of the Wordpress or visit the pages that are not available.
I am using Cloudflare too.
As it seems it's kind of Vrute Force Attack.

I love CWP

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Re: How can I config IPTABLES for DDOS aatacks?
« Reply #3 on: July 27, 2018, 11:32:57 AM »
this should be checked by experienced system admin as it needs to check packages, logs and traffic with tcpdump.
Try asking your hosting provider to assist you on that or cwp support if your provider has no support.
VPS & Dedicated server provider with included FREE Managed support for CWP.
http://www.studio4host.com/

*** Don't allow that your server or website is down, choose hosting provider with included expert managed support for your CWP.