Packet loss by Juniper Firewall after a time period

Hello Friends,

Here i am sharing my personal experience what i faced during work.

In Juniper Firewall mostly problem found continuing Packet loss after a time period it happen because Juniper Firewall have some factory default security configurations here i am posting factory default configuration then i will tell you what are that security configurations.

Juniper Firewall SSG320M Factory Default Configuration:

SSG320M-> get config all

Total Config size 5251:

unset key protection enable
set clock timezone 0
set vrouter trust-vr sharable

set vrouter "untrust-vr"

exit
set vrouter "trust-vr"
unset auto-route-export
exit
set alg appleichat enable
unset alg appleichat re-assembly enable
set alg sctp enable
set auth-server "Local" id 0
set auth-server "Local" server-name "Local"
set auth default auth server "Local"
set auth radius accounting port 1646
set admin name "netscreen"
set admin password "nKVUM2rwMUzPcrkG5sWIHdCtqkAibn"
set admin auth web timeout 10
set admin auth server "Local"
set admin format dos
set zone "Trust" vrouter "trust-vr"
set zone "Untrust" vrouter "trust-vr"
set zone "DMZ" vrouter "trust-vr"
set zone "VLAN" vrouter "trust-vr"
set zone "Untrust-Tun" vrouter "trust-vr"
set zone "Trust" tcp-rst
set zone "Untrust" block
unset zone "Untrust" tcp-rst
set zone "MGT" block
unset zone "V1-Trust" tcp-rst
unset zone "V1-Untrust" tcp-rst
set zone "DMZ" tcp-rst
unset zone "V1-DMZ" tcp-rst
unset zone "VLAN" tcp-rst

set zone "Untrust" screen tear-drop
set zone "Untrust" screen syn-flood
set zone "Untrust" screen ping-death
set zone "Untrust" screen ip-filter-src
set zone "Untrust" screen land
set zone "V1-Untrust" screen tear-drop
set zone "V1-Untrust" screen syn-flood
set zone "V1-Untrust" screen ping-death
set zone "V1-Untrust" screen ip-filter-src
set zone "V1-Untrust" screen land

set interface "ethernet0/0" zone "Trust"

set interface "ethernet0/1" zone "DMZ"
set interface "ethernet0/2" zone "Untrust"
set interface ethernet0/0 ip 192.168.1.1/24
set interface ethernet0/0 nat
unset interface vlan1 ip
unset interface vlan1 bypass-others-ipsec
unset interface vlan1 bypass-non-ip
set interface ethernet0/0 ip manageable
set interface ethernet0/0 manage ping
set interface ethernet0/0 manage ssh
set interface ethernet0/0 manage telnet
set interface ethernet0/0 manage snmp
set interface ethernet0/0 manage ssl
set interface ethernet0/0 manage web
unset interface ethernet0/0 manage ident-reset
set interface ethernet0/0 g-arp
set interface ethernet0/1 manage ping
unset interface ethernet0/1 manage ssh
unset interface ethernet0/1 manage telnet
unset interface ethernet0/1 manage snmp
unset interface ethernet0/1 manage ssl
unset interface ethernet0/1 manage web
unset interface ethernet0/1 manage ident-reset
set interface ethernet0/1 g-arp
unset interface ethernet0/2 manage ping
unset interface ethernet0/2 manage ssh
unset interface ethernet0/2 manage telnet
unset interface ethernet0/2 manage snmp
unset interface ethernet0/2 manage ssl
unset interface ethernet0/2 manage web
unset interface ethernet0/2 manage ident-reset
set interface ethernet0/2 g-arp
set interface vlan1 manage ping
set interface vlan1 manage ssh
set interface vlan1 manage telnet
set interface vlan1 manage snmp
set interface vlan1 manage ssl
set interface vlan1 manage web
unset interface vlan1 manage ident-reset
unset interface vlan1 g-arp
set zone V1-Trust manage ping
set zone V1-Trust manage ssh
set zone V1-Trust manage telnet
set zone V1-Trust manage snmp
set zone V1-Trust manage ssl
set zone V1-Trust manage web
unset zone V1-Trust manage ident-reset
set zone V1-Trust g-arp
unset zone V1-Untrust manage ping
unset zone V1-Untrust manage ssh
unset zone V1-Untrust manage telnet
unset zone V1-Untrust manage snmp
unset zone V1-Untrust manage ssl
unset zone V1-Untrust manage web
unset zone V1-Untrust manage ident-reset
set zone V1-Untrust g-arp
set zone V1-DMZ manage ping
unset zone V1-DMZ manage ssh
unset zone V1-DMZ manage telnet
unset zone V1-DMZ manage snmp
unset zone V1-DMZ manage ssl
unset zone V1-DMZ manage web

unset zone V1-DMZ manage ident-reset

set zone V1-DMZ g-arp
unset zone V1-Null manage ping
unset zone V1-Null manage ssh
unset zone V1-Null manage telnet
unset zone V1-Null manage snmp
unset zone V1-Null manage ssl
unset zone V1-Null manage web
unset zone V1-Null manage ident-reset
set zone V1-Null g-arp
unset flow no-tcp-seq-check
set flow tcp-syn-check
unset flow tcp-syn-bit-check
set flow reverse-route clear-text prefer
set flow reverse-route tunnel always
set pki authority default scep mode "auto"
set pki x509 default cert-path partial
set crypto-policy
exit
set ike respond-bad-spi 1
set ike ikev2 ike-sa-soft-lifetime 60
unset ike ikeid-enumeration
unset ike dos-protection
unset ipsec access-session enable
set ipsec access-session maximum 5000
set ipsec access-session upper-threshold 0
set ipsec access-session lower-threshold 0
set ipsec access-session dead-p2-sa-timeout 0
unset ipsec access-session log-error
unset ipsec access-session info-exch-connected
unset ipsec access-session use-error-log
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
exit
set url protocol websense
exit
set anti-spam profile ns-profile
 set sbl default-server enable
exit
set nsmgmt bulkcli reboot-timeout 60
set ssh version v2
set config lock timeout 5
unset license-key auto-update
set telnet client enable
set snmp port listen 161
set snmp port trap 162
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
unset add-default-route
exit
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
exit
SSG320M->

Here are that security configurations:

set zone "Untrust" screen tear-drop

set zone "Untrust" screen syn-flood

set zone "Untrust" screen ping-death

set zone "Untrust" screen ip-filter-src
set zone "Untrust" screen land
set zone "V1-Untrust" screen tear-drop
set zone "V1-Untrust" screen syn-flood
set zone "V1-Untrust" screen ping-death
set zone "V1-Untrust" screen ip-filter-src
set zone "V1-Untrust" screen land

.

.

.

.

unset flow no-tcp-seq-check
set flow tcp-syn-check

What should do :

unset zone "Untrust" screen tear-drop

unset zone "Untrust" screen syn-flood

unset zone "Untrust" screen ping-death

unset zone "Untrust" screen ip-filter-src
unset zone "Untrust" screen land
unset zone "V1-Untrust" screen tear-drop
unset zone "V1-Untrust" screen syn-flood
unset zone "V1-Untrust" screen ping-death
unset zone "V1-Untrust" screen ip-filter-src
unset zone "V1-Untrust" screen land

.

.

.

set flow no-tcp-seq-check
unset flow tcp-syn-check