Как известно ns2 позволяет реализовывать собственные протоколы пользователя на уровне ядра программы.

Ниже перечислены протоколы поддерживаемые ядром в оригинальной комплектации ns2, в скобках указаны ссылки на скрипты с примерами (ссылки будут доступны позже).

• HTTP, web caching and invalidation, TcpApp (test-suite-webcache.tcl)
• telnet and ftp sources (test-suite-simple.tcl)
• Constant-Bit-Rate (CBR) sources (e.g., in test-suite-cbq.tcl)
• On/Off sources (in test-suite-intserv.tcl)

• базовый протокол ТCP (test-suite-simple.tcl, test-suite-v1{,a}.tcl)
• Tahoe, Reno, New-Reno и SACK TCP (test-suite-tcpVariants.tcl)
• FACK TCP (test-suite-tcpVariants.tcl)
• TCP vegas (test-suite-vegas-v1.tcl)
• New-Reno TCP (test-suite-newreno.tcl)
• SACK TCP (test-suite-sack{,-v1,v1a})
• полный TCP (test-suite-full.tcl)
• TCP initial window behavior (test-suite-tcp.tcl)
• rate-based pacing TCP (test-suite-rbp.tcl)
• RFC-2001 (Reno) TCP behavior (test-suite-rfc2001.tcl)
• RTP (in test-suite-friendly.tcl, not yet added to "validate")
• SRM (in test-suite-srm.tcl)

• algorithmic routing (test-suite-algo-routing)
• hierarchical routing (test-suite-hier-routing.tcl)
• lan routing and broadcast (test-suite-lan.tcl)
• manual routing (test-suite-manual-routing.tcl)
• centralized multicast, DM multicast, not detailedDM, not multicast over LAN (test-suite-mcast.tcl)
• routing dynamics (test-suite-routed.tcl)
• detailed simulation using virtual classifier (test-suite-vc.tcl)
• mixed-mode session-levels simulation (test-suite-mixmode.tcl)
• session-level simulation (test-suite-session.tcl)

• several queue scheduling algorithms: FQ (Fair Queueing), SFQ (Stochastic Fair Queuing), DRR (Deficit Round Robin), FIFO (with drop-tail and RED queue management) (test-suite-schedule.tcl)
• CBQ (both in v1 and v2 mode) (test-stuite-cbq{,-v1,-v1a})
• RED queue management (test-suite-red{,-v1,-v1a})
• ECN behavior (and TCP interactions) (test-suite-ecn.tcl)
• admission control algorithms: MS, HB, ACTP, ACTO, parameter-based (in test-suite-intserv.tcl)

• LANs, with CSMA/CD MAC protocols (in test-suite-lan.tcl)

• Error Modules (e.g., in test-suite-ecn.tcl, test-suite-tcp-init-win.tcl, test-suite-session.tcl, and test-suite-srm.tcl)

In addition there are a number of protocols in the standard ns distribution which are not covered by validate. Because they cannot be automatically tested, bit-rot sometimes breaks these protocols.

We attempt to keep non-validated protocols working and welcome bug reports. Becuase of difficulties maintaining code that we did not write and for which we may not know ``ground truth'', we cannot promise that these protocols will remain working. We strongly encourage people using these protocols in their research to examine their output carefully and implement test suites for them so that we can move them into the ``validated'' category.

Protocols and modules in the core but not validated include:

• Fack and Asym TCP
• RTCP
• RTP
• snoop (believed broken as of 2.1b4)
• LANs with CSMA/CA MAC protocols (tcl/ex/mac-test.tcl), with MultihopMac (mac-multihop.cc), with 802.11 (mac-802_11.cc)
• RLM (Receiver Layered Multicast) (tcl/ex/test-rlm.tcl)
• token bucket filters (tcl/ex/test-tbf.tcl)
• trace-generated sources (tcl/ex/tg.tcl)
• delay-adaptive receivers (tcl/ex/test-rcvr.tcl)
• delay modules (delaymodel.cc)
• IVS (ivs.cc)
• emulation mode
• (many other protocols not yet listed)

Finally, there are a number of contributed protocols described on their own web page. These protocols are often for specific releases of ns and may not work in the current release.

We welcome discussion of contributed protocols on the ns-users mailing list, but we are unlikely to be able to provide support for them. We welcome outside efforts to move these protocols into the core; we will add protocols that include test suites and work with the current release at their authors or users request. In some cases we are actively integrating contributed code on a case-by-case basis (for example, we're currently adding wireless extensions).

Daily status of the validation suite