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- Why you need to know Cisco IOS ACL port numbers
- When working with the Cisco IOS, it's very important to know your TCP and UDP port numbers. This is especially true when creating IOS access control lists ACLs. Let's take a closer look. What's a port number? Most of you likely know what port...
- Blog posts 2007-08-31
Additional Resources
- Getting autonomous with BGP: How Border Gateway Protocol can help you with routing
- BGP is an interautonomous system routing protocol that is heterogeneous and proven. Although routing can sometimes be a rather daunting task, Alexander Prohorenko is here to show you the light with BGP.... BGP is the primary routing protocol that Internet backbones use to exchange routing information...Michael DillonOkay, let's start from...
- Technical articles 2000-12-26
- Get IT Done: Secure your Windows 2000 server using TCP/IP filters
- Use TCP/CP filters to secure Windows 2000 server from internal hackingYour top priority as a network administrator is securing your servers from internal and external hackers. You may have one or more firewalls protecting your internal network from outside hackers, but what do you do about those internal hackers? You...
- Technical articles 2002-06-25
- Get secure with Cisco extended IP access control lists
- This week, the Packet Professor continues his look at Cisco access control lists with a lesson in extended ACLs. With this technique, you can filter traffic both by address and by type of packet, which can help ease your security worries.In my previous article, “Understanding the basics of Cisco IP...
- Technical articles 2001-03-06
- Talking Shop: Protocol pointers to help you pass the 640-607 CCNA exam
- If you want to obtain the Cisco Certified Network Associate CCNA certification, you must pass Cisco Systems certification exam 640-607. The exam is broken into eight categories:Bridging/switchingOSI reference model and layered communicationNetwork protocolsRoutingWAN protocolsNetwork managementLAN designCisco basics, IOS, and network basicsIn this Daily Drill Down, Ill show you the networking...
- Technical articles 2003-03-13
- Error Number: 0x800CCC0E
- The connection to the server has failed. Account: '', Server: 'Mail.domain.com', Protocol: SMTP, Port: 25, SecureSSL: No, Socket Error: 10060, Error Number: 0x800CCC0EBlocked port 25Sounds like port 25 is being blocked:http://support.microsoft.com/default.aspx?scid=kb;en-us;q191687Do you have any firewall software that may be blocking this?Is your router firewall blocking it?I've been having same problem...
- Discussion threads 2004-10-15
- Fire up that Wire! A look at the FireWire protocol
- The FireWire protocol, developed in 1995 by Apple, is now supported by other device manufacturers, including Sony. In this article, Larry Loeb gives you the scoop on this bus/hardware protocol.Apple Computer has included FireWire ports on all its computers since the introduction of the Blue and White G3. FireWire is...
- Technical articles 2001-12-17
- BitTorrent Protocol Abuses
- The BitTorrent protocol is now 7 years old. The protocol has become wildly successful in a very short period of time, but with this success comes growing pains. The protocol originally envisioned by Bram Cohen is fairly secure. Vulnerabilities have been introduced by people trying to do things with the...
- White papers 2009-07-10
- Get IT Done: The iSCSI protocol may be a viable storage option for your company
- Explore the benefits of the iSCSI protocol for storageGiven the perpetual growth of data storage requirements, the marriage of IP and SCSI to create a new storage networking solution is a welcome development. The emergence of the Internet SCSI protocol, or iSCSI, allows companies to take advantage of the IP...
- Technical articles 2002-04-22
- Understanding the RIP protocol
- RIP Routing Information Protocol is one of the most enduring protocols; every system administrator should be familiar with it. In this Daily Drill Down, Alexander Prohorenko shows you how to use RIP.RIP Routing Information Protocol was born to make system administrators happy. Every administrator who has to supervise a large...
- Technical articles 2000-05-23
- Case study: Protocol Systems wins the migration challenge
- In many IT departments, there is a great deal of natural resistance to application migration due to the time involved in planning and performing a systems move. However, support cost issues in a recession-dominated marketplace are now starting to force the need to migrate on a growing number of users....
- Technical articles 2003-03-10
- A Multi-Party User Authentication and Key Agreement Protocol Based on Public Key Cryptosystem
- This paper addresses the problem of multiparty user authentication and key agreement whereby a party gains assurance of the identity of other parties involved in a protocol for preventing impersonation and unauthorized access. Its scheme utilizes the idea of Buttyan, Nagy proposed multi-party challenge -response protocol. The proposed protocol allows...
- White papers 2009-11-02
- Cisco VPN settings
- I am trying to pass a Windows XP client VPN connection through a 1720 Cisco router to a Windows Server 2000 host. I have permitted port 1723 through the GRE47 protocol but I am not sure of the correct syntax. I receive error 769 "Destination unreachable" Can someone tell me...
- Discussion threads 2005-12-07
- Synchronize a Cisco router's clock with Network Time Protocol (NTP)
- It's critical that all devices on an organization's network display the accurate time and date. If they don't, things can go wrong in a hurry. David Davis explains why Cisco devices need to use Network Time Protocol NTP for their time synchronization needs, and he tells you how to configure...
- Technical articles 2005-05-26
- Use TCP to communicate with sockets
- Socket programming sounds difficult and arcane, but this article introduces the concept with Perl code that's easy to understand and use.By Stew BenedictIn a previous article, I discussed the TCP protocol, its purpose, and a number of UNIX system commands you can use to look at TCP operations and control...
- Technical articles 2002-04-01
- A MAC Protocol Based on Adaptive Beamforming for Ad Hoc Networks
- This paper presents a novel slotted MAC Medium Access Control protocol for nodes equipped with adaptive antenna array in ad hoc network. The protocol relies on the ability of antenna to uses DOA (Direction-Of-Arrival) information to beamform by placing nulls in the direction of interferers thus maximize SINR (Signal to...
- White papers 2009-01-01
- Towards Designing Energy-Efficient Routing Protocol for Wireless Mesh Networks
- Different studies have proposed number of routing protocols to overcome data transmission challenges. Very few of these protocols consider node energy. In this study, the state of art work from various studies is reviewed and compared based on the some design criteria that are proposed in this paper. This paper...
- White papers 2009-03-08
- Where is martian from?
- Pls assist me to define martian source.Here is log message:martian source 255.255.255.255 from 1.2.3.4, on dev eth1Here is my network design.======================================== I have W2K with IP adresses:eth0 Ext IP - 1.2.3.4/24eth1 Int IP - 5.6.7.8/24I have Linux box with IP address:eth0 Ext IP - 1.2.3.5/24eth1 Int IP - 5.6.7.9/24=====================================This is...
- Q&A 2005-03-28
- Using Network Time Protocol with NetWare 5.1
- Proper time synchronization is essential on a NetWare network. Ron Nutter shows you how to use NTP with your NetWare 5.1 server to ensure your network has consistent and accurate time settings.Keeping the correct time on workstations and servers on your network is critical. If you remember the NetWare 2.x...
- Technical articles 2000-12-27
- Remote Desktop Tunneling over VPN in Billion Router 7500G
- Hi Guys,Can anyone show me which ports should be open in Billion Router 7500G for Remote Desktop Tunneling over VPN to SBS R2, to allow WinXp clients to connect to File Server at work?When I connect I get error code 721,718 & 735 Any help will be appreciated.thanksVPN ...
- Discussion threads 2008-09-25
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