ASA 5510 Problem Accesing Internet

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    I configured my ASA 5510 with a T1 and I can ping publics domain successfuly from my firewall but I can not but from my lan I can not access Internet. Below is my confiugartion. Please help me:

    matyonkers(config)# sh run
    : Saved
    ASA Version 8.2(1)
    hostname matyonkers
    enable password YjMKbtBBW1l0zqdk encrypted
    passwd 2KFQnbNIdI.2KYOU encrypted
    interface Ethernet0/0
    description Linea Externa
    nameif Externa
    security-level 100
    ip address
    interface Ethernet0/1
    nameif Interna
    security-level 0
    ip address 10.1.x.x
    interface Ethernet0/2
    no nameif
    security-level 0
    no ip address
    interface Ethernet0/3
    no nameif
    security-level 0
    no ip address
    interface Management0/0
    nameif management
    security-level 100
    ip address
    ftp mode passive
    dns domain-lookup Externa
    dns domain-lookup Interna
    dns server-group PublicDns
    dns-group PublicDns
    access-list Externa_access_in extended permit ip any any
    access-list Interna_access_in extended permit ip any any
    access-list Externa_cryptomap extended permit ip any any
    access-list Externa_access_in_1 exten
    access-list Externa_access_in_1 extended permit tcp any any eq https
    access-list Externa_access_in_1 extended permit tcp any any eq www
    access-list Interna_access_in_1 extended permit ip any any
    access-list Externa_access_out extended permit ip any any
    pager lines 24
    logging asdm informational
    mtu Externa 1500
    mtu Interna 1500
    mtu management 1500
    icmp unreachable rate-limit 1 burst-size 1
    no asdm history enable
    arp timeout 14400
    global (Externa) 101
    global (Externa) 101 interface
    nat (Externa) 0
    nat (management) 101
    access-group Externa_access_in_1 in interface Externa
    access-group Externa_access_out out interface Externa
    access-group Interna_access_in_1 in interface Interna
    route Externa 1
    route Interna 10.1.x.x 1
    timeout xlate 3:00:00
    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:
    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
    dynamic-access-policy-record DfltAccessPolicy
    http server enable
    http management
    http Externa
    no snmp-server location
    no snmp-server contact
    crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
    crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
    crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
    crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
    crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
    crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
    crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
    crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
    crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
    crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
    crypto ipsec security-association lifetime seconds 28800
    crypto ipsec security-association lifetime kilobytes 4608000
    crypto map Externa_map0 1 match address Externa_cryptomap
    crypto map Externa_map0 1 set peer
    crypto map Externa_map0 1 set transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-
    crypto isakmp policy 5
    authentication pre-share
    encryption 3des
    hash sha
    group 2
    lifetime 86400
    crypto isakmp policy 10
    authentication pre-share
    encryption des
    hash sha
    group 2
    lifetime 86400
    telnet timeout 5
    ssh timeout 5
    console timeout 0
    dhcpd address Externa
    dhcpd dns interface Externa
    dhcpd enable Externa
    dhcpd address management
    dhcpd enable management
    threat-detection basic-threat
    threat-detection statistics access-list
    no threat-detection statistics tcp-intercept
    username admin password eY/fQXw7Ure8
    tunnel-group type ipsec-l2l
    tunnel-group ipsec-attributes
    pre-shared-key *
    class-map inspection_default
    match default-inspection-traffic
    policy-map type inspect dns preset_dns_map
    message-length maximum 512
    message-length maximum client auto
    policy-map global_policy
    class inspection_default
    inspect dns preset_dns_map
    inspect ftp
    inspect h323 h225
    inspect h323 ras
    inspect rsh
    inspect rtsp
    inspect esmtp
    inspect sqlnet
    inspect skinny
    inspect sunrpc
    inspect xdmcp
    inspect sip
    inspect netbios
    inspect tftp
    service-policy global_policy global
    prompt hostname context
    : end

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