尝试从内部网络到外部网络，我有一个 3560 交换机连接到一个连接到 5520 ASA 防火墙的 2960 交换机。我有一个用于连接到防火墙的外部网络的 Single 3560 交换机。当我ping外部主机时，我没有得到响应，有人可以帮忙吗，谢谢

这是我的防火墙配置：

5520ASA# sh run
: Saved
:
: Serial Number: JMX1131L1ZU
: Hardware:   ASA5520, 2048 MB RAM, CPU Pentium 4 Celeron 2000 MHz
:
ASA Version 9.1(7)
!
hostname 5520ASA
domain-name NetworkBell
enable password 2KFQnbNIdI.2KYOU encrypted
xlate per-session deny tcp any4 any4
xlate per-session deny tcp any4 any6
xlate per-session deny tcp any6 any4
xlate per-session deny tcp any6 any6
xlate per-session deny udp any4 any4 eq domain
xlate per-session deny udp any4 any6 eq domain
xlate per-session deny udp any6 any4 eq domain
xlate per-session deny udp any6 any6 eq domain
names
!
interface GigabitEthernet0/0
 nameif inside
 security-level 100
 ip address 192.168.1.10 255.255.255.0
!
interface GigabitEthernet0/1
 nameif outside
 security-level 0
 ip address 192.168.2.20 255.255.255.0
!
interface GigabitEthernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.3.1 255.255.255.0
!
ftp mode passive
dns server-group DefaultDNS
 domain-name NetworkBell
object network outside3560
 host 192.168.2.21
object network inside3560
 host 192.168.1.11
object-group icmp-type ping
 icmp-object echo
 icmp-object echo-reply
access-list outside_access_in extended permit icmp object outside3560 object inside3560 object-group ping
access-list inside extended permit icmp host 192.168.1.11 host 192.168.2.21
access-list outside extended permit icmp host 192.168.2.21 host 192.168.1.11
pager lines 24
mtu management 1500
mtu inside 1500
mtu outside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
access-group inside in interface inside
access-group outside_access_in global
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
aaa authentication ssh console LOCAL
http server enable
http 192.168.160.41 255.255.255.255 management
http 192.168.3.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
ssh stricthostkeycheck
ssh 192.168.3.0 255.255.255.0 management
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
dhcpd address 192.168.3.2-192.168.3.254 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
username cisco password 3USUcOPFUiMCO4Jk encrypted
!
!
!
policy-map global_policy
!
prompt hostname context
no call-home reporting anonymous
call-home
 profile CiscoTAC-1
  no active
  destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
  destination address email callhome@cisco.com
  destination transport-method http
  subscribe-to-alert-group diagnostic
  subscribe-to-alert-group environment
  subscribe-to-alert-group inventory periodic monthly
  subscribe-to-alert-group configuration periodic monthly
  subscribe-to-alert-group telemetry periodic daily
Cryptochecksum:d41d8cd98f00b204e9800998ecf8427e
: end
5520ASA#