Tweak DDWRT Speed

This is the best DD WRT Internet Tweak that I have used from 2016 till now. It modifies your internet packet data.Tested, it's smooth even when connected to a 4g LTE modem.

 Tested my DDWRT device bridging with my 4G LTE modem

 

Hopefully this simple tweak might help some developer application and users.
Give me some credit for this script and my time.

#This Tweak applied on DDWRT root devices. #Tested with DD-WRT v3.0-r36410 std (07/28/18). #New FIX Tweak 24/01/2024 #It takes for me 5 years+ to check,observe and test this tweak. #Post credit : http://aril83.blogspot.com @ Shahril Zaili #This is deafult path to UNIX dir,change it until you know what it is. PrefixIPV4=/proc/sys/net/ipv4 PrefixIPV6=/proc/sys/net/ipv6 #Set your TTL here,Windows 128,Android 64 SetupTTLPacket=64 #Set your DNS here SetupDNS1=1.1.1.1 SetupDNS2=8.8.8.8 #HashSize #echo 16384 > ${PrefixIPV6}/netfilter/ip_conntrack_max #echo 16384 > /sys/module/nf_conntrack/parameters/hashsize #Set TTL echo ${SetupTTLPacket} > ${PrefixIPV4}/ip_default_ttl # Tweak ICMP echo 0 > ${PrefixIPV4}/icmp_echo_ignore_all echo 0 > ${PrefixIPV4}/icmp_echo_ignore_broadcasts #Must be ON by Bridging echo 1 > ${PrefixIPV4}/ip_forward echo 1 > ${PrefixIPV4}/ip_forward_use_pmtu #Enabled this with caution #echo 16384 > ${PrefixIPV4}/ip_conntrack_max # Network Speed Lvl 1 echo 0 > ${PrefixIPV4}/tcp_mtu_probing echo 0 > ${PrefixIPV4}/tcp_window_scaling echo 1 > ${PrefixIPV4}/tcp_dsack echo 1 > ${PrefixIPV4}/tcp_fastopen echo 1 > ${PrefixIPV4}/tcp_syn_retries echo 1 > ${PrefixIPV4}/tcp_synack_retries echo 1 > ${PrefixIPV4}/tcp_tw_recycle echo 1 > ${PrefixIPV4}/tcp_tw_reuse echo 1 > ${PrefixIPV4}/tcp_moderate_rcvbuf # End Network Speed Lvl 1 #Demux the packet echo 0 > ${PrefixIPV4}/ip_early_demux echo 1 > ${PrefixIPV4}/tcp_early_demux echo 1 > ${PrefixIPV4}/udp_early_demux #End Demux #### Swithing Tweak ##### #Method 1 echo 1 > ${PrefixIPV4}/ip_no_pmtu_disc echo 0 > ${PrefixIPV4}/tcp_timestamps echo 0 > ${PrefixIPV4}/tcp_rfc1337 echo 0 > ${PrefixIPV4}/tcp_no_metrics_save echo 0 > ${PrefixIPV4}/tcp_fack echo 0 > ${PrefixIPV4}/tcp_ecn echo 0 > ${PrefixIPV4}/tcp_sack #Method 2 #echo 0 > ${PrefixIPV4}/ip_no_pmtu_disc #echo 1 > ${PrefixIPV4}/tcp_timestamps #echo 1 > ${PrefixIPV4}/tcp_sack #echo 1 > ${PrefixIPV4}/tcp_rfc1337 #echo 1 > ${PrefixIPV4}/tcp_no_metrics_save #echo 1 > ${PrefixIPV4}/tcp_fack #echo 1 > ${PrefixIPV4}/tcp_ecn #### End Swithing Tweak ##### #IPTables DNS Rules iptables -t mangle -I POSTROUTING -o eth0 -j TTL --ttl-set ${SetupTTLPacket} iptables -t mangle -I PREROUTING -i eth0 -j TTL --ttl-set ${SetupTTLPacket} #Remove the hashtag if this DDWRT bridging with another internet gateway device #iptables -t mangle -I POSTROUTING -o br0 -j TTL --ttl-set ${SetupTTLPacket} #iptables -t mangle -I PREROUTING -i br0 -j TTL --ttl-set ${SetupTTLPacket} #iptables -t nat -A PREROUTING -i br0 -p udp --dport 53 -j DNAT --to ${SetupDNS1} #iptables -t nat -A PREROUTING -i br0 -p udp --dport 53 -j DNAT --to ${SetupDNS2} #iptables -t nat -A PREROUTING -i br0 -p tcp --dport 53 -j DNAT --to ${SetupDNS1} #iptables -t nat -A PREROUTING -i br0 -p tcp --dport 53 -j DNAT --to ${SetupDNS2} #End IPTable DNS

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This for those who love using sysctl than direct echo command on unix

#This Tweak applied on DDWRT root devices. #Tested with DD-WRT v3.0-r36410 std (07/28/18). #New FIX Tweak 24/01/2024 #It takes for me 5 years+ to check,observe and test this tweak. #Post credit : http://aril83.blogspot.com @ Shahril Zaili #This is deafult path to UNIX dir,change it until you know what it is. PrefixIPV4=/proc/sys/net/ipv4 PrefixIPV6=/proc/sys/net/ipv6 #Set your TTL here,Windows 128,Android 64 SetupTTLPacket=64 #Set your DNS here SetupDNS1=1.1.1.1 SetupDNS2=8.8.8.8 #HashSize #echo 16384 > ${PrefixIPV6}/netfilter/ip_conntrack_max #echo 16384 > /sys/module/nf_conntrack/parameters/hashsize #Set TTL echo ${SetupTTLPacket} > ${PrefixIPV4}/ip_default_ttl #Set TTL sysctl -w ${PrefixIPV4}/ip_default_ttl=${SetupTTLPacket} #Disabled Ipv6 sysctl -w ${PrefixIPV6}/conf/default/disable_ipv6=1 sysctl -w ${PrefixIPV6}/conf/all/disable_ipv6=1 # Tweak ICMP sysctl -w ${PrefixIPV4}/icmp_echo_ignore_all=0 sysctl -w ${PrefixIPV4}/icmp_echo_ignore_broadcasts=0 #Must be ON by Bridging sysctl -w ${PrefixIPV4}/ip_forward=1 sysctl -w ${PrefixIPV4}/ip_forward_use_pmtu=1 #Enabled this with caution #sysctl -w 16384 > ${PrefixIPV4}/ip_conntrack_max # Network Speed Lvl 1 sysctl -w ${PrefixIPV4}/tcp_window_scaling=0 sysctl -w ${PrefixIPV4}/tcp_mtu_probing=0 sysctl -w ${PrefixIPV4}/tcp_dsack=1 sysctl -w ${PrefixIPV4}/tcp_fastopen=1 sysctl -w ${PrefixIPV4}/tcp_syn_retries=1 sysctl -w ${PrefixIPV4}/tcp_synack_retries=1 sysctl -w ${PrefixIPV4}/tcp_tw_recycle=1 sysctl -w ${PrefixIPV4}/tcp_tw_reuse=1 sysctl -w ${PrefixIPV4}/tcp_moderate_rcvbuf=1 # End Network Speed Lvl 1 #Demux the packet sysctl -w ${PrefixIPV4}/ip_early_demux=0 sysctl -w ${PrefixIPV4}/tcp_early_demux=1 sysctl -w ${PrefixIPV4}/udp_early_demux=1 #End Demux #### Swithing Tweak ##### #Method 1 sysctl -w ${PrefixIPV4}/ip_no_pmtu_disc=1 sysctl -w ${PrefixIPV4}/tcp_timestamps=0 sysctl -w ${PrefixIPV4}/tcp_rfc1337=0 sysctl -w ${PrefixIPV4}/tcp_no_metrics_save=0 sysctl -w ${PrefixIPV4}/tcp_fack=0 sysctl -w ${PrefixIPV4}/tcp_ecn=0 sysctl -w ${PrefixIPV4}/tcp_sack=0 #Method 2 #sysctl -w ${PrefixIPV4}/ip_no_pmtu_disc=0 #sysctl -w ${PrefixIPV4}/tcp_timestamps=1 #sysctl -w ${PrefixIPV4}/tcp_sack=1 #sysctl -w ${PrefixIPV4}/tcp_rfc1337=1 #sysctl -w ${PrefixIPV4}/tcp_no_metrics_save=1 #sysctl -w ${PrefixIPV4}/tcp_fack=1 #sysctl -w ${PrefixIPV4}/tcp_ecn=1 #### End Swithing Tweak ##### #IPTables DNS Rules iptables -t mangle -I POSTROUTING -o eth0 -j TTL --ttl-set ${SetupTTLPacket} iptables -t mangle -I PREROUTING -i eth0 -j TTL --ttl-set ${SetupTTLPacket} #Remove the hashtag if this DDWRT bridging with another internet gateway device #iptables -t mangle -I POSTROUTING -o br0 -j TTL --ttl-set ${SetupTTLPacket} #iptables -t mangle -I PREROUTING -i br0 -j TTL --ttl-set ${SetupTTLPacket} #iptables -t nat -A PREROUTING -i br0 -p udp --dport 53 -j DNAT --to ${SetupDNS1} #iptables -t nat -A PREROUTING -i br0 -p udp --dport 53 -j DNAT --to ${SetupDNS2} #iptables -t nat -A PREROUTING -i br0 -p tcp --dport 53 -j DNAT --to ${SetupDNS1} #iptables -t nat -A PREROUTING -i br0 -p tcp --dport 53 -j DNAT --to ${SetupDNS2} #End IPTable DNS

1) Copy all code inside text-area,then access to DDWRT Router it's should be http://192.168.1.1 as default.

2) Then go through Administration > Commands > Save Startup.or else click here to go to commands section.

3) Paste it over Commands Shell section text-area

4) Save startup on DDWRT Command GUI

5) After all these steps are done, please reboot your DD WRT router (twice) 2x to see the effect

Take a look at MyTweak on LTE android smartphones

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