diff --git a/src/Fox_Debian_99_Sysctl.conf b/src/Fox_Debian_99_Sysctl.conf
index 85e1eda..88b5139 100644
--- a/src/Fox_Debian_99_Sysctl.conf
+++ b/src/Fox_Debian_99_Sysctl.conf
@@ -11,9 +11,9 @@ net.ipv4.tcp_congestion_control = bbr
 
 net.ipv4.conf.all.log_martians = 1
 
-net.ipv4.icmp_ratelimit = 100
 net.ipv4.igmp_max_memberships = 100
 
+net.ipv4.tcp_challenge_ack_limit = 1000
 net.ipv4.tcp_fin_timeout = 30
 net.ipv4.tcp_keepalive_time = 120
 net.ipv4.tcp_max_orphans = 4096
@@ -22,3 +22,4 @@ net.ipv4.tcp_syncookies = 1
 
 net.ipv6.conf.all.use_tempaddr = 0
 net.ipv6.conf.default.use_tempaddr = 0
+