Strangeness of IPsec

Hello guys,.

I just set up an IPsec Site to Site VPN on the following topology in GNS3:

All configs are OK on both routers and ping test show that the VPN tunnel works correctly.

My question would be, why routers use policies automatic configuration of the phase 1 (with 2 on two priority routers) instead of using the default (priority 1)?

If I'm right, lower priority values have a higher precedence here.

R1 #sh crypto isakmp policy

World IKE policy
Priority protection Suite 2
encryption algorithm: AES - Advanced Encryption Standard (128-bit keys).
hash algorithm: Secure Hash Standard
authentication method: pre-shared Key
Diffie-Hellman group: #2 (1024 bits)
life expectancy: 600 seconds, no volume limit

Default protection suite
encryption algorithm: - Data Encryption STANDARD (56-bit keys).
hash algorithm: Secure Hash Standard
authentication method: Rivest-Shamir-Adleman Signature
Diffie-Hellman group: #1 (768 bits)
lifetime: 86400 seconds, no volume limit

As I said, the traffic of users use Phase2 appropriate two-way tunnels:

R1 #show crypto engine connections active

Algorithm of address State IP Interface ID encrypt decrypt
2001 Serial0/0 23.0.0.1 defined AES256 + 0 48 SHA
2002 Serial0/0 23.0.0.1 defined AES256 + SHA 49 0

You have an idea?

Thanks in advance!

The policy with the highest priority is with the number down the police. All of your configured strategies have a higher priority (and fewer) then the default policy.

Tags: Cisco Security

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    (it's the weird NAT problem I see. I see the number of hits is increment only when I run the packet tracer understands even I have pings (traffic) the 192.168.171.8 constant welcomes the 10.2.4.1/28)-s'il please see the package I pasted after the capture section)

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    IP/ID=192.168.171.8 DST, mask is 255.255.255.255, port = 0, dscp = 0 x 0

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    2: 12:26:53.376597 10.2.4.1 > 192.168.10.252: icmp: echo reply

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    4: 12:27:01.489217 192.168.171.8 > 10.2.4.1: icmp: echo request

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    6: 12:27:03.378825 10.2.4.1 > 192.168.10.252: icmp: echo reply

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    8: 12:27:11.491856 192.168.171.8 > 10.2.4.1: icmp: echo request

    8 packets shown

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    I'm Karen with it. In addition, he is a firewall multi-tenant live production with no problems at all outside this for a Juniper ipsec tunnel!

    Also, the 192.168.10.0/24 is another remote network of IPSec tunnel to this network of 10.2.4.0/28 and this IPSEC tunnel has a similar Juniper SSG 140 screen os 6.3.0r9.0 at the remote end and this woks like a charm with no problems, but the 171 is not be encrypted by the ASA at all.

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    Perfect! Now you must find something else inside for tomorrow--> forecast rain again

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    View details of ra-ikev1-ipsec-vpn-sessiondb

    display the filter retail ra-ikev1-ipsec-vpn-sessiondb p-ipaddress

    These will provide information on the type of VPN Client connection.

    Here are a few out of different situations when connecting with the VPN Client

    Dynamic PAT - no Transparent on the Client VPN tunnel

    • Through the VPN connections do not work as connects via PAT without Transparent tunnel

    Username: Index: 22

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IPsec IKEv1

    IKEv1:

    Tunnel ID: 22.1

    The UDP Src Port: 18451 UDP Dst Port: 500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28551 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsec:

    Tunnel ID: 22.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28551 seconds

    Idle Time Out: 30 Minutes idling left: 25 Minutes

    TX Bytes: 0 Rx bytes: 0

    TX pkts: Rx Pkts 0: 0

    Dynamic PAT - Transparent tunnel (NAT/PAT) on the VPN Client

    • Via VPN connections work as we use Tunneling Transparent when we train the dynamic VPN Client through PAT connection

    Username: Index: 28

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IKEv1 IPsecOverNatT

    IKEv1:

    Tunnel ID: 28.1

    The UDP Src Port: 52825 UDP Dst Port: 4500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28784 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsecOverNatT:

    Tunnel ID: 28.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28784 seconds

    Idle Time Out: 30 Minutes idling left: 30 Minutes

    TX Bytes: 360 bytes Rx: 360

    TX pkts: 6 Pkts Rx: 6

    Dynamics PAT, Transparent IPsec (TCP) on the Client VPN tunnel

    • Via VPN connections work as we use Tunneling Transparent when we train the dynamic VPN Client through PAT connection

    Username: Index: 24

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IKEv1 IPsecOverTCP

    IKEv1:

    Tunnel ID: 24.1

    The UDP Src Port: 20343 UDP Dst Port: 500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28792 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsecOverTCP:

    Tunnel ID: 24,2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel TCP Src Port: 20343

    The TCP Dst Port: 10000

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28792 seconds

    Idle Time Out: 30 Minutes idling left: 30 Minutes

    TX Bytes: 180 bytes Rx: 180

    TX pkts: Rx 3 Pkts: 3

    Static NAT - no Transparent on the Client VPN tunnel

    • VPN Client connections to the LAN work because our VPN Client has a static NAT configured for its local IP address. This allows the ESP without encapsulation through the device doing the static NAT. You must allow the ESP traffic through the NAT device of management of the device VPN or configure VPN connections inspection if there is an ASA acting as the NAT device.

    Username: Index: 25

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IPsec IKEv1

    IKEv1:

    Tunnel ID: 25.1

    The UDP Src Port: 50136 UDP Dst Port: 500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28791 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsec:

    Tunnel ID: 25.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28791 seconds

    Idle Time Out: 30 Minutes idling left: 30 Minutes

    TX Bytes: 120 bytes Rx: 120

    TX pkts: Rx 2 Pkts: 2

    Static NAT - Transparent tunnel (NAT/PAT) on the VPN Client

    • The VPN Client connections are functioning normally. Even if the host Staticly using a NAT VPN Client does not need UDP encapsulation it is always used if your connection of the VPN Client profile is configured to use (tab in the Transport of the client software)

    Username: Index: 26

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IKEv1 IPsecOverNatT

    IKEv1:

    Tunnel ID: 26.1

    The UDP Src Port: 60159 UDP Dst Port: 4500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28772 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsecOverNatT:

    Tunnel ID: 26.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28772 seconds

    Idle Time Out: 30 Minutes idling left: 29 Minutes

    TX Bytes: 1200 bytes Rx: 1200

    TX pkts: Rx 20 Pkts: 20

    Static NAT - Transparent tunnel on the VPN Client (IPsec, TCP)

    • The VPN Client connections are functioning normally. Even if the host Staticly using a NAT VPN Client does not need TCP encapsulation it is always used if your connection of the VPN Client profile is configured to use (tab in the Transport of the client software)

    Username: Index: 27

    Public IP address 10.0.1.2 assigned IP::

    Protocol: IKEv1 IPsecOverTCP

    IKEv1:

    Tunnel ID: 27.1

    The UDP Src Port: 61575 UDP Dst Port: 500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: AES 256 hash: SHA1

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28790 seconds

    Group D/H: 2

    Name of the filter:

    Client OS: Windows NT Client OS worm: 5.0.07.0290

    IPsecOverTCP:

    Tunnel ID: 27.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 10.0.1.2/255.255.255.255/0/0

    Encryption: AES 256 hash: SHA1

    Encapsulation: Tunnel TCP Src Port: 61575

    The TCP Dst Port: 10000

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 28790 seconds

    Idle Time Out: 30 Minutes idling left: 30 Minutes

    TX Bytes: 120 bytes Rx: 120

    TX pkts: Rx 2 Pkts: 2

    VPN device with a public IP address directly connected (as a customer VPN) to an ASA

    Username: Index: 491

    Assigned IP: 172.31.1.239 public IP address:

    Protocol: IPsec IKE

    IKE:

    Tunnel ID: 491.1

    The UDP Src Port: 500 UDP Dst Port: 500

    IKE Neg Mode: Aggressive Auth Mode: preSharedKeys

    Encryption: 3DES hash: SHA1

    Generate a new key Int (T): 86400 seconds given to the key Left (T): 71016 seconds

    Group D/H: 2

    Name of the filter:

    IPsec:

    Tunnel ID: 491.2

    Local addr: 0.0.0.0/0.0.0.0/0/0

    Remote addr: 172.31.1.239/255.255.255.255/0/0

    Encryption: AES128 hash: SHA1

    Encapsulation: Tunnel

    Generate a new key Int (T): 28800 seconds given to the key Left (T): 12123 seconds

    Generate a new key Int (D): 4608000 K-bytes given to the key Left (D): 4607460 K-bytes

    Idle Time Out: 0 Minutes idling left: 0 Minutes

    TX Bytes: bytes 3767854 Rx: 7788633

    TX pkts: 56355 Pkts Rx: 102824

    Above are examples for your reference. I must also say that I am absolutely not an expert when it comes to virtual private networks in general. I had to learn two firewall/vpn basically on my own, as during my studies, we had no classes related to them (which was quite strange).

    While I learned how to set up VPN and troubleshoot them I think I missed on the basic theory. I had plans to get the title Associates CCNA/CCNP certifications but at the moment everything is possible. Don't have the time for it.

    I guess that you already go to the VPN security CCNP Exam?

    Hope this helps and I hope that I didn't get anything wrong above

    -Jouni

  • PIX 501 establish IPSEC connection, but no data transmission

    Hi all

    I had a strange problem with a cisco 501 pix connected cisco 3000 vpn concentrator remotely.

    The pix is configured for the remote access session to the hub. The problem is that when I do a ping the ipsec tunnel is established and bytes will be transmittet but it's no or few bytes are received by the hub.

    So I can't? t ping Lan behind the pix.

    I don't know what could be the probelem. The two phases are created.

    What can be the problem?

    Attached to the PIX config.

    Best regards

    Kai

    6.3 (4) version PIX

    interface ethernet0 car

    interface ethernet1 100full

    ethernet0 nameif outside security0

    nameif ethernet1 inside the security100

    activate the password xxx

    passwd xxx

    host name

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    fixup protocol dns-length maximum 512

    fixup protocol ftp 21

    fixup protocol h323 h225 1720

    fixup protocol h323 ras 1718-1719

    fixup protocol http 80

    fixup protocol rsh 514

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    fixup protocol sip udp 5060

    fixup protocol 2000 skinny

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    fixup protocol sqlnet 1521

    fixup protocol tftp 69

    names of

    outside ip access list allow a whole

    inside_access_in ip access list allow a whole

    pager lines 24

    MTU outside 1456

    MTU inside 1456

    IP address outside pppoe setroute

    IP address inside 123.0.0.200 255.255.255.0

    alarm action IP verification of information

    alarm action attack IP audit

    location of PDM 123.0.0.0 255.255.255.0 inside

    PDM logging 100 information

    history of PDM activate

    ARP timeout 14400

    Global 1 interface (outside)

    NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

    outside access-group in external interface

    inside_access_in access to the interface inside group

    Timeout xlate 0:05:00

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    Timeout, uauth 0:05:00 absolute

    GANYMEDE + Protocol Ganymede + AAA-server

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    AAA-server GANYMEDE + deadtime 10

    RADIUS Protocol RADIUS AAA server

    AAA-server RADIUS 3 max-failed-attempts

    AAA-RADIUS deadtime 10 Server

    AAA-server local LOCAL Protocol

    Enable http server

    http 123.0.0.0 255.255.255.0 inside

    No snmp server location

    No snmp Server contact

    SNMP-Server Community public

    No trap to activate snmp Server

    enable floodguard

    Telnet 133.0.0.0 255.255.255.0 inside

    Telnet timeout 5

    SSH timeout 5

    Console timeout 0

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    VPDN group pppoe_group localname *.

    VPDN group ppp authentication pap pppoe_group

    VPDN username *.

    password *.

    vpnclient Server 111.x.x.200

    vpnclient mode network-extension-mode

    vpnclient vpngroup vpn password *.

    vpnclient user_name password pix *.

    vpnclient enable

    Terminal width 80

    Cryptochecksum:xxxx

    : end

    you are the ping of the network behind the hub to devices behind the PIX?

    You can then check if you see the data received on the end of PIX? You can check that by issueing the command

    Crypto ipsec to show his

    It will tell you by his how many bytes have been received / sent.

    If you see bytes received and sent and they will increase after you issue a ping (usually the increase is 4 packs), you know this isn't the pix, but something as nat-traversal that blocks the return circulation.

  • Cisco 1841 ipsec tunnel protocol down after a minute

    I have a strange problem where im manages to get a tha cisco ipsec tunnel 1841 to a RV016 linksys/cisco for about a minute and ping/encrypt the packets through the linen for about a minute before it breaks down. I tried different configuration and it all results in the tunnel for a minute then descend to come. I don't know if im hitting a bug and decide to if im doing something wrong.

    any help is appreciated paul

    RV016 firmware 2.0.18

    Cisco 1841: C1841-ADVENTERPRISEK9-M), Version 12.4 (24) T

    my config

    no default isakmp crypto policy

    !

    crypto ISAKMP policy 1

    BA 3des

    md5 hash

    preshared authentication

    Group 2

    lifetime 28800

    ISAKMP crypto key address 0.0.0.0 eaton1234 0.0.0.0

    !

    !

    Crypto ipsec transform-set esp-3des esp-sha-hmac ESSTS

    transport mode

    no default crypto ipsec transform-set

    !

    Crypto ipsec profile ipsec_profile1

    Description in the location main site to site VPN tunnel

    game of transformation-ESSTS

    PFS group2 Set

    !

    !

    !

    !

    !

    !

    !

    Tunnel1 interface

    Description of the location of the hand

    IP unnumbered Serial0/0/0

    source of tunnel Serial0/0/0

    destination 209.213.x.x tunnel

    ipv4 ipsec tunnel mode

    tunnel path-mtu-discovery

    protection of ipsec profile ipsec_profile1 tunnel

    !

    a debug output

    Apr 24 16:42:07: IPSEC (validate_proposal_request): part #1 the proposal

    Apr 24 16:42:07: IPSEC (validate_proposal_request): part #1 of the proposal

    (Eng. msg key.) Local INCOMING = 209.213.xx.46, distance = 209.213.xx.164,.

    local_proxy = 10.20.86.0/255.255.255.0/0/0 (type = 4),

    remote_proxy = 10.0.0.0/255.255.255.0/0/0 (type = 4),

    Protocol = ESP, transform = NONE (Tunnel),

    lifedur = 0 and 0kb in

    SPI = 0 x 0 (0), id_conn = 0, keysize = 0, flags = 0 x 0

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    ADR SRC: 10.20.86.0

    ADR DST: 10.0.0.0

    Protocol: 0

    SRC port: 0

    DST port: 0

    Apr 24 16:42:07: IPSEC (key_engine): had an event of the queue with 1 KMI message (s)

    Apr 24 16:42:07: mapdb Crypto: proxy_match

    ADR SRC: 10.20.86.0

    ADR DST: 10.0.0.0

    Protocol: 0

    SRC port: 0

    DST port: 0

    Apr 24 16:42:07: IPSEC (policy_db_add_ident): src dest 10.0.0.0, 10.20.86.0, dest_port

    0

    Apr 24 16:42:07: IPSEC (create_sa): its created.

    (his) sa_dest = 209.213.xx.46, sa_proto = 50,.

    sa_spi = 0x4CF51011 (1291128849).

    sa_trans = sa_conn_id of hmac-sha-esp, esp-3des = 2045

    sa_lifetime(k/sec) = (4463729/3600)

    Apr 24 16:42:07: IPSEC (create_sa): its created.

    (his) sa_dest = 209.213.xx.164, sa_proto = 50,.

    sa_spi = 0x1EB77DAF (515341743).

    sa_trans = sa_conn_id of hmac-sha-esp, esp-3des = 2046

    sa_lifetime(k/sec) = (4463729/3600)

    Apr 24 16:42:07: % LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, sta changed

    you to

    Apr 24 16:42:07: IPSEC (key_engine): had an event of the queue with 1 KMI message (s)

    Apr 24 16:42:07: IPSEC (key_engine_enable_outbound): rec would notify of ISAKMP

    Apr 24 16:42:07: IPSEC (key_engine_enable_outbound): select SA with spinnaker 515341743/50

    Apr 24 16:42:07: IPSEC (update_current_outbound_sa): update peer 209.213.xx.164 curre

    NT his outgoing to SPI 1EB77DAF

    Apr 24 16:42:12: IPSEC (key_engine): request timer shot: count = 1,.

    local (identity) = 209.213.xx.46, distance = 209.213.xx.164,

    local_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4),

    remote_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4)

    Apr 24 16:42:12: IPSEC (sa_request):,.

    (Eng. msg key.) Local OUTGOING = 209.213.xx.46, distance = 209.213.xx.164,.

    local_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4),

    remote_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4),

    Protocol = ESP, transform = esp-3des esp-sha-hmac (Tunnel),

    lifedur = 3600 s and KB 4608000,

    SPI = 0 x 0 (0), id_conn = 0, keysize = 0, flags = 0 x 0

    Apr 24 16:42:42: IPSEC (key_engine): request timer shot: count = 2,.

    local (identity) = 209.213.xx.46, distance = 209.213.xx.164,

    local_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4),

    remote_proxy = 0.0.0.0/0.0.0.0/0/0 (type = 4)

    Apr 24 16:42:42: % LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, sta changed

    you all the downu

    All possible debugging has been disabled

    I would try to set up a VPN Interface virtual Tunnel on the IOS router base and the value of defined transformation in tunnel mode no transport.

    In history, I have had several issues with VPN between a router IOS and the series RV.

  • Some IPSec sessions associated with tunnel stop working

    Hello

    Since I left an IPSec tunnel a router IOS to a Version running 3020 4.1.7.E there was a strange situation with a tunnel to a VPN Checkpoint 4.1: Tunnel get no problem but various IPSec sessions disappear with the only way to reset the being of "disconnection" (dixit the Sessions ' administer') whole tunnel can discuss again with interesting traffic. Example:

    -VPN 1 with 3 Sessions IPSec 172.1.30.x, 89.170.11.x and 192.168.3.x

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    -It is not the case that the timeout of sessions has lost because they can be used in when it happens

    All the world faced a similar situation?

    I can't restrict logging to a counterpart to activate useful debugging - we have a number of LAN-to-LAN tunnels and quite a few customers. Can someone help me in this respect?

    I do not give the Checkpoint but can pass on ideas to those that do, if anyone has any.

    If I need to provide more information tell me what you need.

    Thanks for any help you can provide.

    Visit www.cisco.com/techsupport/ and select the security and vpn, check for troubleshooting for this document.

  • Cisco 1941 DMVPN and Ipsec

    Hello

    You start to replace all of our ISA Server with with DMVPN cisco routers.  So far, we are happy with everything, but I ran into a problem.  I've just set up one of our agencies and the DMVPN works very well, but this location also has a VPN tunnel to another branch that we have not replaced with Cisco equipment yet.  The problem I have is that as soon as I associate an ipsec site-to-site VPN on the router, the DMVPN drops.

    I create the Ipsec VPN:

    map VPN_Crypto 1 ipsec-isakmp crypto

    game of transformation-ESP-3DES-SHA

    the value of aa.aa.aa.aa peer

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    interface GigabitEthernet0/1

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    interface Tunnel0

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    Yes, but I don't see anything looking for strange (well, configs generated by CCP always sound strange...).

    Maybe you run into a bug. Have you tried a different IOS? Personally I wouldn't use 15.2 if I have to. You can try 15.0 (1) M8 and see if it works.

    --
    Don't stop once you have upgraded your network! Improve the world by lending money to low-income workers:
    http://www.Kiva.org/invitedBy/karsteni

  • IPsec vpn and Anyconnect is denied by the ACL (unknown)

    I am trying to configure IPsec VPN and I used the wizard of asdm (asdm version 8.4, ASA version 8.4). At the moment he is not in production and is in a test environment. Whenever I try to VPN in I get an error on the asdm syslog saying "TCP access denied by ACL from x.x.x.122 to outside:x.x.x.225/443. So I allowed all VPN traffic to this IP address that is currently the IP address as the external interface. My acl is as follows:

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  • Help on configuring ipsec

    Hello

    We have 30 sites wan that we have configured for ipsec. the configuration is the same with 3des-sha-pfs2-isakmp. We met an unknown problem.after, allowing some of the Tunnels, we have discovered that the work one and the rest are disconnected. the interesting thing is that for example today I removed a single tunnel of the config and the problem was resolved temporary but there again it is the same thing. the error I get is strange, he mentions that the profile of peers is not found or the peer itself is unknown.

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    Thank you

    OK, I had the problem with your configuration. You must have a different list of access for each location that is specific to that particular place. In your case, all traffic will correspond to the first instance of crypto and therefore will not work for other locations.

  • Why a strange alphabet does not appear when I type in an address box. Integration is slow and hesitant and numbers and letters are often repeated on their own?

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