diff --git a/vpnsetup.sh b/vpnsetup.sh
index 28d0b1b..a9527dc 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -354,27 +354,16 @@ bigecho "Updating sysctl settings..."
 
 if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
   conf_bk "/etc/sysctl.conf"
-  if [ "$(getconf LONG_BIT)" = "64" ]; then
-    SHM_MAX=68719476736
-    SHM_ALL=4294967296
-  else
-    SHM_MAX=4294967295
-    SHM_ALL=268435456
-  fi
 cat >> /etc/sysctl.conf <<EOF
 
 # Added by hwdsl2 VPN script
 kernel.msgmnb = 65536
 kernel.msgmax = 65536
-kernel.shmmax = $SHM_MAX
-kernel.shmall = $SHM_ALL
 
 net.ipv4.ip_forward = 1
-net.ipv4.conf.all.accept_source_route = 0
 net.ipv4.conf.all.accept_redirects = 0
 net.ipv4.conf.all.send_redirects = 0
 net.ipv4.conf.all.rp_filter = 0
-net.ipv4.conf.default.accept_source_route = 0
 net.ipv4.conf.default.accept_redirects = 0
 net.ipv4.conf.default.send_redirects = 0
 net.ipv4.conf.default.rp_filter = 0
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index e0bbf4d..0655456 100755
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -348,27 +348,16 @@ bigecho "Updating sysctl settings..."
 
 if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
   conf_bk "/etc/sysctl.conf"
-  if [ "$(getconf LONG_BIT)" = "64" ]; then
-    SHM_MAX=68719476736
-    SHM_ALL=4294967296
-  else
-    SHM_MAX=4294967295
-    SHM_ALL=268435456
-  fi
 cat >> /etc/sysctl.conf <<EOF
 
 # Added by hwdsl2 VPN script
 kernel.msgmnb = 65536
 kernel.msgmax = 65536
-kernel.shmmax = $SHM_MAX
-kernel.shmall = $SHM_ALL
 
 net.ipv4.ip_forward = 1
-net.ipv4.conf.all.accept_source_route = 0
 net.ipv4.conf.all.accept_redirects = 0
 net.ipv4.conf.all.send_redirects = 0
 net.ipv4.conf.all.rp_filter = 0
-net.ipv4.conf.default.accept_source_route = 0
 net.ipv4.conf.default.accept_redirects = 0
 net.ipv4.conf.default.send_redirects = 0
 net.ipv4.conf.default.rp_filter = 0