Cisco Tips & Tricks

June 7, 2006

How to block skype

Filed under: Access-lists, QOS, Router, security — ciscotips @ 4:36 am

On April 4th 2006, Cisco released IOS version 12.4 (4) T. Cisco introduced much awaited Skype classification in NBAR . So now with simple policy you can block skype. Skype can be blocked in a similar way as we use to block kazza,limewire and other p2p applications.


NBAR configuration to drop Skype packets

class−map match−any p2p
match protocol skype

policy−map block−p2p
class p2p

int FastEthernet0
description PIX−facing interface
service−policy input block−p2p

If you are unsure about the bandwidth eating applications being used in your organisation. you can access the interface connected to the Internet and configure following command

ip nbar protocol-discovery.

This will enable nbar discovery on your router.

Use following command:-

show ip nbar protocol-discovery stats bit-rate top-n 10

it will show you top 10 bandwidth eating applications being used by the users. Now you will be able to block/restrict traffic with appropriate QoS policy.

we can also use ip nbar port-map command to look for the protocol or protocol name, using a port number or numbers other than the well-known Internet Assigned Numbers Authority (IANA)-assigned) port numbers.

Usage as per cisco:-
ip nbar port-map protocol-name [tcp | udp] port-number

Up to 16 ports can be specified with this command. Port number values can range from 0 to 65535


  1. Tried to block the skype with reference to this article. But not able to block. Has this been tested by anyone…

    Comment by sagar — August 18, 2006 @ 4:18 am

  2. Sagar,

    Yes, this is tested!

    Which version of IOS were you using? I am not sure how you implemented? send me your topology and configuration.

    PS:- mail id you mentioned during submitting your comment is invalid. I tried to send you a mail but it was bounced back.


    Comment by Sikandar — August 18, 2006 @ 10:21 am

  3. Hi Sikandar,

    IOS version I am using is 12.4.6(T3).
    Hv implemented the same way what mentioned in this reference document on my Internet router.

    I have corrected my mail ID( sorry for typo error.


    Comment by sagar — August 18, 2006 @ 11:06 am

  4. Skype is tough to block, I would say one of the hardest to block. I would like to hear if you have had any success with it.

    Comment by Cisco Forum — September 18, 2006 @ 7:02 pm

  5. Tested! and its working perfectly fine!

    Comment by Sikandar — September 19, 2006 @ 2:24 am

  6. Sagar,
    I tried to block with the reference above and it didnt work too, i’m using 12.4(4)T2. Can anyone help?

    Comment by Kim — October 1, 2006 @ 7:07 pm

  7. can you send me your topology and configuration of both pix and the router?

    Comment by Sikandar — October 1, 2006 @ 7:15 pm

  8. router: cisco 877, with DMVPN, using ios firewall
    outbound interface: Tunnel 2
    inbound interface: VLAN 1 (f0)

    A portion of the config for your review…
    ip inspect name IOS_FW appfw IOS_FW
    ip inspect name IOS_FW cuseeme
    ip inspect name IOS_FW dns
    ip inspect name IOS_FW ftp
    ip inspect name IOS_FW h323
    ip inspect name IOS_FW http urlfilter
    ip inspect name IOS_FW https
    ip inspect name IOS_FW icmp
    ip inspect name IOS_FW imap
    ip inspect name IOS_FW pop3
    ip inspect name IOS_FW netshow
    ip inspect name IOS_FW rcmd
    ip inspect name IOS_FW realaudio
    ip inspect name IOS_FW rtsp
    ip inspect name IOS_FW esmtp
    ip inspect name IOS_FW sqlnet
    ip inspect name IOS_FW streamworks
    ip inspect name IOS_FW tftp
    ip inspect name IOS_FW udp
    ip inspect name IOS_FW vdolive

    ip nbar port-map custom-01 udp 1 65535
    ip nbar port-map custom-01 tcp 1 65535

    class-map match-any p2p_skype
    match protocol skype
    match protocol custom-01

    appfw policy-name IOS_FW
    application im msn
    service default action reset
    service text-chat action reset
    server deny name
    server deny name
    server deny name
    audit-trail on
    alert on

    Interface Tunnel 2
    ip inspect IOS_FW out
    ip access-group 101 in
    service-policy input appfwp2p_IOS_FW
    service-policy output appfwp2p_IOS_FW

    interface Vlan1
    description Connection to LAN$FW_INSIDE$
    ip address
    ip nat inside
    ip virtual-reassembly
    hold-queue 32 in
    hold-queue 100 out

    ip nat inside source list 10 pool NAT_POOL overload
    ip route Tunnel2

    Extended IP access list 101
    10 deny ip any
    20 deny ip any
    30 deny ip any
    40 deny ip any
    50 deny ip host any
    130 permit icmp any any echo-reply
    140 permit icmp any any time-exceeded
    150 permit icmp any any unreachable (21 matches)
    160 deny ip any any (11176 matches)

    Standard IP access list 10
    10 permit, wildcard bits

    Comment by Kim — October 1, 2006 @ 7:45 pm

  9. from the configuration given above, i can’t see where you created a policy for blocking skype. i can only see a class map for sype but i can’t see in which policy yoy are applying that class map.

    you need to create a policy and apply it to pix-facing interface.
    policy−map block−p2p
    class p2p

    int FastEthernet0
    description PIX−facing interface
    service−policy input block−p2p

    Comment by Sikandar — October 1, 2006 @ 8:15 pm

  10. sorry, i left it out in my previous posting… but it was in my router config.

    policy-map appfwp2p_IOS_FW
    class p2p_skype

    tried to apply the policy on either the tunnel interface and FastE but skype is still able to logon after i restart it.

    interface FastEthernet0
    description Connection to LAN
    service-policy input appfwp2p_IOS_FW
    service-policy output appfwp2p_IOS_FW

    Comment by Kim — October 2, 2006 @ 3:05 am

  11. Hi Kim
    It will not work on tunnel interface as it is interface for creating tunnel betweern two end points. you need to think this way that on which direction you need to block your traffic.

    I am not sure what your full config is but it seems that you have a split tunneling enable so even if you block skype at your end, because of your VPN tunnel it will be able to access from the other side.

    As i told you earlier it would be great if you can send me full configuration of the both ends. I want to understand how exactly you are accessing your internet.

    Comment by Sikandar — October 2, 2006 @ 6:33 am

  12. now skype is blocked in dubai internet city as well, whether you use a vpn or not…
    they use the software of this evil company , statisticians turned into censors…
    do you have an idea how it works and how it could bypassed?
    this is really anoying everyone in there…
    any help appreciated…

    Comment by Lapin — November 23, 2006 @ 9:03 am

  13. Hi,

    We are using NetScreen 50 Firewall in our network and need to block Skype. Our office is based in London.

    Can anyone help me regarding this?


    Comment by Sidd — December 12, 2006 @ 1:46 pm

  14. there is a widely used skype and P2P blocking solution in opensource.
    check this link
    I’ve heard that this solution is what companies use to forbid skype within their network. China is suspected to use this or a derivative
    I think that providing that kind of censorship technology is in total contradiction with the opensource philosophy. Some people suspect Skype to be at the origin of this blocking initiative, for political reasons.

    Comment by lapinmalin — December 25, 2006 @ 10:23 am

  15. Comment by Anonymous — January 25, 2007 @ 1:01 am

  16. lynanda, cisco/nbar 😦
    we have test both, both are not reliable. after some minutes the skype client can establish a connection to the skype network.

    skype seems to be unblockable

    Comment by frustratedadmin — March 16, 2007 @ 10:05 am

  17. I’m having the same kind of issues restricting most traffic. I am using NAT and NBAR, and I believe that NBAR is not recognising the correct ports after they have been changed for NAT. Perhaps this is the case for most people?

    I’m pretty sure I read somewhere that Cisco routers look at the routing table, access-lists and class-maps/NBAR before doing any port translations, but this doesn’t seem to be the case for me.

    If I allow ftp full outbound bandwidth, matched by NBAR on my WAN interface, (hoping this was BEFORE the translation to LAN) and then show “ip nbar proto ftp”, NBAR does not recognise any ftp traffic leaving or entering the WAN interface.

    It seems most people here are doing this on some kind of internet router with NAT running. The only way I can get NBAR to recognise any specific traffic is to use port-forwarding. Bittorrent on port 6881 forwarded to a workstation DOES get seen by NBAR, same with web without port-forwarding, but everything else is showing up in the “unknown” category.

    So long story short, if your workstation has the same inside port as the source outside port, NBAR seems to recognise it. If not, it’s “unknown” traffic on ports anywhere between 1 and 65000-odd.

    Check your Skype/whatever local inside port on a Windows box from a DOS prompt with:
    “netstat” (enter)

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  19. I there,

    I would like to block bittorrent p2p on my boader cisco router. My IOS version is:
    Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(3e), RELEASE SOFTWARE (fc2)
    It does does not comes with bittorrent protocol, is there any way I can upgrade my IOS so I can have a bittorrent protocol blocking capability on my router?

    Comment by David Bila — July 9, 2007 @ 4:24 pm

  20. Hi, I have a Linksys WRT300N roter and I want to know how I can set it up to block Skype and other websites I do not want users to visit?

    Comment by Wil — July 11, 2007 @ 4:33 pm

  21. Dear Sir

    we are not able to block skypee in our router 2801

    Comment by Desai — September 14, 2007 @ 6:57 am

  22. Hi, I have a Cisco 2801 router and I want to know how I can set it up to block Skype and Google talk

    Comment by Desai — September 14, 2007 @ 6:58 am

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  24. can some 1 tell me how to block metacafe or p to p software on cisco 877 modem.

    Comment by Faisal — November 20, 2007 @ 9:16 am

  25. please send me the config of cisco 877 modem which block sites etc.

    Comment by Faisal — November 20, 2007 @ 9:17 am

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  27. I am using CISCO876. I’ve tried to block skype on all station in subnet class except on ip address!

    Can someone tell where is my mistake?
    here is the conf:
    class-map match-any MESS-TRAFFIC
    match protocol skype
    match protocol irc
    class-map match-all MESS-ALOW
    match class-map MESS-TRAFFIC
    match access-group 120
    policy-map DENY-MESSINGER
    class MESS-ALOW
    interface FastEthernet0
    interface FastEthernet1
    interface FastEthernet2
    interface FastEthernet3
    interface Vlan1
    ip address
    no ip redirects
    no ip unreachables
    no ip proxy-arp
    ip nbar protocol-discovery
    ip nat inside
    no ip virtual-reassembly
    ip tcp adjust-mss 1452
    service-policy input DENY-MESSINGER
    interface Dialer1
    mtu 1492
    ip address negotiated
    ip access-group ANTISPOOFING in
    ip verify unicast source reachable-via rx allow-default 101
    no ip redirects
    no ip unreachables
    no ip proxy-arp
    ip nat outside
    ip inspect autosec_inspect out
    no ip virtual-reassembly
    encapsulation ppp
    dialer pool 1
    ppp chap hostname XXXX
    ppp chap password XXXXX
    ppp pap sent-username XXXXX password XXXX
    ip route Dialer1
    no ip http server
    ip http secure-server
    ip nat inside source list 1 interface Dialer1 overload
    ip nat inside source static udp 29695 interface Dialer1 29695
    ip nat inside source static tcp 29695 interface Dialer1 29695
    ip nat inside source static udp 69 interface Dialer1 69
    ip access-list extended ANTISPOOFING
    deny ip any
    deny ip any
    deny ip any
    deny ip any any
    access-list 1 permit
    access-list 101 permit udp any any eq bootpc
    access-list 120 permit ip any any
    access-list 120 deny ip host any

    sh ip nbar port-map skype
    There is no output?

    sh ip nbar protocol-discovery interface vlan 1 stats bit-rate

    Protocol 5min Bit Rate (bps) 5min Bit Rate (bps)
    ———————— ———————— ————————
    telnet 3000 5000
    http 4000 0
    bittorrent 0 0
    h323 0 0
    secure-http 0 0
    skype 0 0
    dns 0 0
    netbios 0 0
    novadigm 0 0
    socks 0 0
    rtp 0 0
    mgcp 0 0
    xwindows 0 0
    unknown 0 146000
    Total 7000 151000

    Skype is working on every PC station,not only on mine
    Help pls!
    Thanx in advance!

    Comment by Bojan — December 21, 2007 @ 2:12 pm

  28. you have to change your SDM setting before applying policy routing in your layer 3 switch. Please refer to the following commands:
    1) show sdm prefer
    2) sdm prefer routing

    Comment by fhy1 — January 15, 2008 @ 7:47 am

  29. Actually I can identify Skype packets of all types, both TCP and UDP, with minimal processing overhead, guaranteed identification and blocking – good enough even for the largest ISPs. Per packet overhead is negligible. I wonder if my C source could be integrated into the IOS and how?

    Comment by Sean O'Neil — January 29, 2008 @ 11:42 am

  30. How can I block Skype using Cisco PIX 525?

    Comment by a.salnikov — February 4, 2008 @ 11:46 am

  31. I want to add this protocol on my nbar. which ports useing skype or p2p. how can i add?

    Comment by bertolucci — February 8, 2008 @ 3:01 pm

  32. Hi,

    There is this company called Nevis Networks. They have had a pretty good success rate in blocking many kinds of P2P and IM applications.

    Give them a dekko.



    Comment by amit — June 4, 2008 @ 7:30 am

  33. hi! how can block p2p (like utorrent and limewire) in my cisco 1841
    router. pls. send me the config…. thanks…

    Comment by atozz — June 6, 2008 @ 10:04 am

  34. YOu shold get differen approach to achieve success with Skype
    permit only protocols that you need and company needs from and deny everything else using nbar if you like you can police skype traffik to something very low or put this traffic on scavenger class but you should have idea what cisco matches with nbar its only Skype 1 versions
    that can be fingerprinted the newwest versions of Skypes are different and not getting matchet by nbar :))

    Comment by dr.X — September 25, 2008 @ 9:30 am

  35. hi.. im using cisco firewall PIX 525 can u send me pls. how to block my P2P limewire …


    Comment by exit — October 7, 2008 @ 7:40 am

  36. hi.. im using cisco firewall PIX 525 can u send me pls. how to block my P2P limewire …


    Comment by exit — October 7, 2008 @ 7:41 am

  37. Blocking skype isn’t working for me.
    I get “Message not delivered” in skype, then 3sec later the box will go away and say delivered.

    My Config:

    class-map match-any p2p
    match protocol skype
    match protocol gnutella
    match protocol irc
    match protocol kazaa2
    match protocol edonkey
    policy−map block−p2p
    class p2p
    interface FastEthernet2/0
    description TO PIX
    service-policy input block-p2p

    It didn’t work, so I added this command and still didn’t block skpe.
    interface FastEthernet2/0
    service-policy output block-p2p

    “show ip nbar port” does not have skpe mapped to a port? What are the ports for skpe so I can map it myself?

    3845#sh ip nbar port
    port-map bgp udp 179
    port-map bgp tcp 179
    port-map bittorrent tcp 6881 6882 6883 6884 6885 6886 6887 6888 6889
    port-map citrix udp 1604
    port-map citrix tcp 1494
    port-map cuseeme udp 7648 7649 24032
    port-map cuseeme tcp 7648 7649
    port-map dhcp udp 67 68
    port-map directconnect tcp 411 412 413
    port-map dns udp 53
    port-map dns tcp 53
    port-map edonkey tcp 4662
    port-map exchange tcp 135
    port-map fasttrack tcp 1214
    port-map finger tcp 79
    port-map ftp tcp 21
    port-map gnutella udp 6346 6347 6348
    port-map gnutella tcp 6346 6347 6348 6349 6355 5634
    port-map gopher udp 70
    port-map gopher tcp 70
    port-map h323 udp 1300 1718 1719 1720 11720
    port-map h323 tcp 1300 1718 1719 1720 11000 – 11999
    port-map http tcp 80
    port-map imap udp 143 220
    port-map imap tcp 143 220
    port-map irc udp 194
    port-map irc tcp 194
    port-map kerberos udp 88 749
    port-map kerberos tcp 88 749
    port-map l2tp udp 1701
    port-map ldap udp 389
    port-map ldap tcp 389
    port-map mgcp udp 2427 2727
    port-map mgcp tcp 2427 2428 2727
    port-map netbios udp 137 138
    port-map netbios tcp 137 139
    port-map netshow tcp 1755
    port-map nfs udp 2049
    port-map nfs tcp 2049
    port-map nntp udp 119
    port-map nntp tcp 119
    port-map notes udp 1352
    port-map notes tcp 1352
    port-map novadigm udp 3460 3461 3462 3463 3464 3465
    port-map novadigm tcp 3460 3461 3462 3463 3464 3465
    port-map ntp udp 123
    port-map ntp tcp 123
    port-map pcanywhere udp 22 5632
    port-map pcanywhere tcp 65301 5631
    port-map pop3 udp 110
    port-map pop3 tcp 110
    port-map pptp tcp 1723
    port-map printer udp 515
    port-map printer tcp 515
    port-map rcmd tcp 512 513 514
    port-map rip udp 520
    port-map rsvp udp 1698 1699
    port-map rtsp tcp 554
    port-map secure-ftp tcp 990
    port-map secure-http tcp 443
    port-map secure-imap udp 585 993
    port-map secure-imap tcp 585 993
    port-map secure-irc udp 994
    port-map secure-irc tcp 994
    port-map secure-ldap udp 636
    port-map secure-ldap tcp 636
    port-map secure-nntp udp 563
    port-map secure-nntp tcp 563
    port-map secure-pop3 udp 995
    port-map secure-pop3 tcp 995
    port-map secure-telnet tcp 992
    port-map sip udp 5060
    port-map sip tcp 5060
    port-map skinny tcp 2000 2001 2002
    port-map smtp tcp 25
    port-map snmp udp 161 162
    port-map snmp tcp 161 162
    port-map socks tcp 1080
    port-map sqlnet tcp 1521
    port-map sqlserver tcp 1433
    port-map ssh tcp 22
    port-map streamwork udp 1558
    port-map sunrpc udp 111
    port-map sunrpc tcp 111
    port-map syslog udp 514
    port-map telnet tcp 23
    port-map tftp udp 69
    port-map vdolive tcp 7000
    port-map winmx tcp 6699
    port-map xwindows tcp 6000 6001 6002 6003

    Any suggestions or does nbar not work for skype?

    Comment by IT Girl — December 23, 2008 @ 12:00 am

  38. thanks guys, did help on a setup 😉

    Comment by gazduire web — March 14, 2009 @ 6:36 pm

  39. Hi guys, just wanted to drop a line and say that newer versions of Skype will be tracked by nbar under enhancement request CSCsg19895, which you can periodically check on the Bug Toolkit @ (this is noted as an enhancement bug since the protocol changed).

    Comment by rtfmdude — March 26, 2009 @ 5:08 am

  40. rtfmdude, the answer because Skype works with cisco IOS running NBAR is that Skype try to connect in the standards ports, and if it can´t connect encapsulates the traffic in http. Obviusly all the organization has the http port enabled and they can´t filter it, it´s the same that happen with p2p applications.

    Comment by beacause — May 20, 2009 @ 2:28 am

  41. How can i block MSN, Yahoo Messenger and Windows Live Mail ?
    I have seen some of my emplyees using MSN Messenger, Yahoo Messenger and Windows Live Mail at work, which is not allowed ! Especially chatting.

    Their Job is just to simply do browse, and are allowed to use Firefox & Safari Browser. But they use Movies downloading & chatting.

    Do you know how can i have both these applications blocked on their Mac? We have Small network around 25 to 30 computers & we use most of the machine are Apple Mac latest. Network is on Linksys Cisco Router. i am having admin password & login name for Router.
    Please Help me to block. Thank you

    Comment by Prak — July 5, 2009 @ 8:22 am

  42. Thanks to SSH and port forwarding, I can bypass my employer’s Skype filter.

    This constant battle between users and policy enforcers is just a total waste of everybody’s time. There’s always a way around every attempt to block something.

    Comment by Tobias — September 10, 2009 @ 1:26 am

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    Comment by Heinz Waechter — September 21, 2009 @ 9:53 am

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    Comment by santosh — December 4, 2009 @ 3:08 pm

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    Comment by Ranto — December 8, 2009 @ 4:01 pm

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  61. […] How to block skype | Cisco Tips & Tricks – Jun 07, 2006 · Tried to block the skype with reference to this article. But not able to block. Has this been tested by anyone… Comment by sagar — August 18, 2006 @ 4 …… […]

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