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- Bypassing Group Policy
- HI My students have figured out that you can bypass group policy by logging in once then loggin out, remove the network cable, login and when it says cant find roaming profile put the cable back in and click ok. All policys no longer work!! I have tried...
- Discussion threads 2007-05-02
- Examining intrusion and nonintrusion network attacks
- The differences between intrusion and nonintrusion attacks are like night and day. Nevertheless, both attacks can render your server useless. Debra Littlejohn Shinder sets out to highlight these differences in this Daily Drill Down.In her last Daily Drill Down, Debra Littlejohn Shinder defined the various types of hacking exploits, the...
- Technical articles 2001-05-10
- TCP hijacking
- TCP hijacking is a dangerous technique that intruders can use to gain access to Internet servers. Read this Daily Drill Down to find out if you understand TCP hijacking well enough to build an effective defense against hackers who use it."To kill the Enemy, you should know him as well...
- Technical articles 2000-03-23
Additional Resources
- Making Better Use of All Those TCP ACK Packets
- Many TCP connections show an asymmetric traffic pattern where significantly more data is sent in one direction than the other resulting in large numbers of ACK-only packets to be generated. This paper proposes and evaluates two independent approaches for how to make better use of the available space in TCP...
- White papers 2007-01-01
- Implicit MAC Acknowledgment: An Optimization to 802.11
- In the recent years, IEEE 802.11 has become the de facto standard for medium access control in wireless LANs and ad hoc networks. One problem with 802.11 is the high investment of bandwidth to control packets like RTS, CTS, and ACK. With the increasing trend in available data rates, this...
- White papers
- Augmented Split-TCP Over Wireless LANs
- This paper introduces a new split-TCP approach for improving TCP performance over IEEE 802.11-based wireless LANs. TCP over wireless LANs is not aggressive, which is a fundamental reason for poor performance. This paper proposes augmented split-TCP (AS-TCP) to mitigate this problem. The scheme extends the split-connection approach that divides a...
- White papers 2006-02-20
- Modeling TCP Throughput Over Wired/Wireless Heterogeneous Networks for Receiver-Based ACK Splitting Mechanism
- Recently, heterogeneous networks with wired and wireless links are becoming common. However, the performance of TCP data transmission deteriorates significantly over such networks because of packet losses caused by the high bit error rate of wireless links. The paper had proposed receiver-based ACK splitting mechanism to solve that problem previously....
- White papers 2006-04-22
- Adding Network-Layer Intelligence to Mobile Receivers for Solving Spurious TCP Timeout During Vertical Handoff
- With the help of Mobile IP/IPv6 and soft handoff, on-going TCP sessions can remain active and handoff packet loss can be avoided. However, TCP still faces several performance degradation issues due to the disparities in bandwidth and propagation delay between different access networks. Particularly, during vertical handoffs, some undesirable phenomenon...
- White papers 2006-09-18
- End-to-end Fairness for TCP Traffic in 802.11e Wireless Mesh Networks Without Coordination
- This paper considers end-to-end per-station1 and per-flow fair bandwidth allocations for TCP traffic in 802.11 based multi-radio multi-hop networks. First it shows that TCP ACK packets have to be prioritised using IEEE 802.11e since otherwise congestion losses of ACK packets cause unpredictable performance. Then it proves that prioritising ACK packets...
- White papers 2007-07-03
- Performance Analysis of the IEEE 802.11e Block ACK Scheme in a Noisy Channel
- A Block ACK BTA scheme has been proposed in IEEE 802.11e to improve Medium Access Control MAC layer performance. It is also a promising technique for next-generation high-speed Wireless LANs WLANs such as IEEE 802.11n. The paper presents a theoretical model to evaluate MAC saturation throughput of this scheme. This...
- White papers 2005-09-22
- Investigation of the Block ACK Scheme in Wireless Ad-Hoc Networks
- A Block Transmission and Acknowledgement BTA scheme, also called Block ACK, has been proposed in the IEEE 802.11e Wireless LAN WLAN specification to improve efficiency of the medium access control layer. The idea of the BTA scheme is to transmit multiple data frames followed by only one acknowledgment frame in...
- White papers 2006-03-30
- The Effect of Reverse Traffic on the Performance of New TCP Congestion Control Algorithms
- Several new TCP congestion control algorithms have been proposed to speed up the TCP over very fast networks. All these algorithms propose their own modifications of the increasing/decreasing phases of classic Reno/NewReno TCP. On the other hand, all of them preserve the self-clocking mechanism, which is a fundamental part of...
- White papers 2007-01-01
- A Smart TCP Acknowledgment Approach for Multihop Wireless Networks
- Reliable data transfer is one of the most difficult tasks to be accomplished in multihop wireless networks. Traditional transport protocols like TCP face severe performance degradation over multihop networks given the noisy nature of wireless media as well as unstable connectivity conditions in place. The success of TCP in wired...
- White papers 2006-08-14
- M-TCP+: Using Disconnection Feedback to Improve Performance of TCP in Wired/Wireless Networks
- This paper proposes the M-TCP+ algorithm for heterogeneous wired/wireless networks. The algorithm is a modification of M-TCP that was proposed for deployment in mobile cellular networks. It is recommended that Internet hosts enable the delayed acknowledgement delayed ACK option to maximize network bandwidth by reducing the number of ACKs sent...
- White papers 2007-06-28
- Occasional wireless connection problem - DHCP offers received, but no ack.
- Perhaps someone could shed some light on this very mysterious problem one machine occasionally encounters which can last a whole day:For no apparent reason, when the computer tries to connect to the network the computer doesn't believe it's receiving a DHCP ack and gets stuck at the DHCP request stage...
- Discussion threads 2007-06-03
- Denial of Service Tuning for Cisco IOS Software Firewall and Intrusion Prevention System
- Cisco IOS Stateful Packet Inspection maintains counters of the number of "Half-open" TCP connections, as well as the total connection rate through the firewall and intrusion prevention software. These half-open connections are TCP connections that have not completed the SYN - SYN/ACK - ACK handshake that is always used by...
- White papers 2006-07-01
- TCP Dynamics in 802.11 Wireless Local Area Networks
- In 802.11 wireless links with disabled MAC retries, data and ACK packets within a TCP session collide resulting in packet losses. This paper shows that in this situation, certain popular optimizations of TCP (fast-recovery) worsen the performance by causing deadlocks that terminate with timeouts. The performance of optimized TCP versions...
- White papers 2007-03-01
- TCP Fairness for Uplink and Downlink Flows in WLANs
- In WLANs, fairness is an important issue because the channel is shared by many users. This paper proposes a dual queue based scheme in an Access Point AP for TCP fairness among uplink flows and downlink flows. First, the paper discusses the unfairness problem of TCP flows due to different...
- White papers 2006-10-30
- Novel Probability-Based Access Control Protocol for Wireless LAN
- This paper proposes a novel probability-based access control protocol for wireless LAN, which outperforms the traditional CSMA Carrier Sense Multiple Access protocol for WLAN on delay and throughput according to the theory and simulation of this paper. Consider a system with n active stations accessing a multi-access channel. The random...
- White papers 2007-06-01
- Girls in Tech aims for a cutting-edge approach to supporting women in IT
- Website Needs WorkOMG. I was excited to read about this organization, but then I viewed their website. Ack! It really needs work!
- Discussion threads 2007-06-11
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