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  • raw h.264 packet capture and playing in VLC

    - by MAC
    Hi, I am capturing packets off the network from a video conference HDX. The video is sent in RTP and is encoded in H264. I am trying to capture these packets and generate a video file. I wrote raw H264 data from the packets to disk and i am trying to play it in VLC. VLC just shows a green box. Am i being too naive in my approach with data writing or should am I wrong in assuming that VLC should play this file? Anyone have any experience in such things?

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  • determine if chipset is capable off packet injection and monitor mode

    - by Richard
    Hi, I am new to linux and I want to know if my chipset is capable off doing those things My chipset is a intel centrino advanced 6200-n on a sony vayo laptop running on windows 7. Now, I know that windows is only capable off listening, so I boot backtrack 4 from a usb stick. I also want to know if a live distribution can work flawlessly with the wificard even if it does not support formentioned things, because I try'd to use wget to download something and it says it ca not resolve the address? thanks, Richard

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  • Capturing wireless traffic (using Wireshark).

    - by Daisetsu
    When I run wireshark on a wired network it works fine and reports all of the packets. When I run it on a wireless network though I only see my own traffic. The wireless card I have is supposed to support packet capture and go into premiscous mode, but I don't see any other system traffic. What is wrong?

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  • Video packet capture over multiple IP cameras

    - by nimals1986
    Hello We are working on a C language application which is simple RTSP/RTP client to record video from Axis a number of Cameras . We launch a pthread for each of the camera which establishes the RTP session and begins to record the packets captured suing the recvfrom() call... A single camera single pthread records fine for well over a day without issues.. but testing with more cameras available,about 25(so 25 pthreads), the recording to file goes fine for like 15 to 20 mins and then the recording just stops ..the application still keeps running .. Its been over a month and a half we have been trying with varied implementations but nothing seems to help .. Please provide suggestions.. We are using CentOS 5 platform

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  • How does ospf control flooding?

    - by iamrohitbanga
    What method is used by ospf protocol to prevent looping of flooded packets for link state advertisements? The packet header does not contain any timestamp. How do the routers recognize that it is the same advertisement that they sent before?

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  • Debugger for Iptables

    - by chris_l
    Hi, I'm looking for an easy way to follow a packet through the iptables rules. This is not so much about logging, because I don't want to log all traffic (and I only want to have LOG targets for very few rules). Something like Wireshark for Iptables. Or maybe even something similar to a debugger for a programming language. Thanks Chris

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  • Capturing wirelss traffic (using Wireshark).

    - by Daisetsu
    When I run wireshark on a wired network it works fine and reports all of the packets. When I run it on a wireless network though I only see my own traffic. The wireless card I have is supposed to support packet capture and go into premiscous mode, but I don't see any other system traffic. What is wrong?

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  • How should I handle incomplete packet buffers?

    - by Benjamin Manns
    I am writing a client for a server that typically sends data as strings in 500 or less bytes. However, the data will occasionally exceed that, and a single set of data could contain 200,000 bytes, for all the client knows (on initialization or significant events). However, I would like to not have to have each client running with a 50 MB socket buffer (if it's even possible). Each set of data is delimited by a null \0 character. What kind of structure should I look at for storing partially sent data sets? For example, the server may send ABCDEFGHIJKLMNOPQRSTUV\0WXYZ\0123!\0. I would want to process ABCDEFGHIJKLMNOPQRSTUV, WXYZ, and 123! independently. Also, the server could send ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890LOL123HAHATHISISREALLYLONG without the terminating character. I would want that data set stored somewhere for later appending and processing. Also, I'm using asynchronous socket methods (BeginSend, EndSend, BeginReceive, EndReceive) if that matters.

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  • Discovering maximum packet size

    - by ereOn
    I'm working on a network-related project and I am using DTLS (TLS/UDP) to secure communications. Reading the specifications for DTLS, I've noted that DTLS requires the DF flag (Don't Fragment) to be set. On my local network if I try to send a message bigger than 1500 bytes, nothing is sent. That makes perfect sense. On Windows the sendto() reports a success but nothing is sent. I obviously cannot unset the DF flag manually since it is mandatory for DTLS and i'm not sure whether the 1500 bytes limit (MTU ?) could change in some situations. I guess it can. So, my question is : "Is there a way to discover this limit ?" If not, what would be the lowest possible value ? My software runs under UNIX (Linux/MAC OSX) and Windows OSes so different solutions for each OS are welcome ;) Many thanks.

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  • What happens if a server never receives the RST packet?

    - by Rob
    Someone recently decided to show me a POC of a new Denial of Service method using SYN/TCP he's figured out. I thought it was complete nonsense, but after explaining to him about SYN-SYN/ACK-RST, he left me speechless. He told me "what if the server you're using to trick into sending the SYN/ACK packets can't receive the RST packet?" I have no idea. He claims that the server will continue trying to send SYN/ACK packets, and that the packetrate will continue to build up. Is there any truth to this? Can anyone elaborate? Apparently, the way it works is this: He spoofs the IP of the SYN packet to the target's IP. He then sends the SYN packet to a handful of random servers They all reply with their SYN/ACK packet to the target IP, of course The target responds with RST, as we know BUT somehow he keeps the target from sending the RST or keeps the random servers from processing it With this, apparently the servers will continue trying to send the SYN/ACK packets, thus producing a somewhat of a "snowball" effect.

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  • Jumbo Packet in 1 Gigabit Ethernet- help

    - by user322374
    Hi, I would like to know about Jumbo Packets using UDP in 1 Giga etherent. What are the delays in such system? i think of using jumbo packets in my system because i need to transfer a lot of data between 2 computers. i tried to find information about the delays and what are the disadvantages using jumbo packets in 1 gigabit- i didn't find a lot. (I find many advantages but i would like to know also the disadvantages) Thank you very much for the help,

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  • send and recive packet in the Lan with multiple mac Addresses in C#

    - by MGH
    Hi , in our Network bandwith assign to mac address and if you can get more than one , you can get more bandwith :) if there any application or class in C# that can do this .... I'm already have the http proxy or port maper to send packets in different ip addresses but because of they are use same mac address it won't work . Any help is appreciated .

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  • obtaining nimbuzz server certificate for nmdecrypt expert in NetMon

    - by lurscher
    I'm using Network Monitor 3.4 with the nmdecrypt expert. I'm opening a nimbuzz conversation node in the conversation window and i click Expert- nmDecrpt - run Expert that shows up a window where i have to add the server certificate. I am not sure how to retrieve the server certificate for nimbuzz XMPP chat service. Any idea how to do this? this question is a follow up question of this one. Edit for some background so it might be that this is encrypted with the server pubkey and i cannot retrieve the message, unless i debug the native binary and try to intercept the encryption code. I have a test client (using agsXMPP) that is able to connect with nimbuzz with no problems. the only thing that is not working is adding invisible mode. It seems this is some packet sent from the official client during login which i want to obtain. any suggestions to try to grab this info would be greatly appreciated. Maybe i should get myself (and learn) IDA pro? This is what i get inspecting the TLS frames on Network Monitor: Frame: Number = 81, Captured Frame Length = 769, MediaType = ETHERNET + Ethernet: Etype = Internet IP (IPv4),DestinationAddress:[...],SourceAddress:[....] + Ipv4: Src = ..., Dest = 192.168.2.101, Next Protocol = TCP, Packet ID = 9939, Total IP Length = 755 - Tcp: Flags=...AP..., SrcPort=5222, DstPort=3578, PayloadLen=715, Seq=4101074854 - 4101075569, Ack=1127356300, Win=4050 (scale factor 0x0) = 4050 SrcPort: 5222 DstPort: 3578 SequenceNumber: 4101074854 (0xF4716FA6) AcknowledgementNumber: 1127356300 (0x4332178C) + DataOffset: 80 (0x50) + Flags: ...AP... Window: 4050 (scale factor 0x0) = 4050 Checksum: 0x8841, Good UrgentPointer: 0 (0x0) TCPPayload: SourcePort = 5222, DestinationPort = 3578 TLSSSLData: Transport Layer Security (TLS) Payload Data - TLS: TLS Rec Layer-1 HandShake: Server Hello.; TLS Rec Layer-2 HandShake: Certificate.; TLS Rec Layer-3 HandShake: Server Hello Done. - TlsRecordLayer: TLS Rec Layer-1 HandShake: ContentType: HandShake: - Version: TLS 1.0 Major: 3 (0x3) Minor: 1 (0x1) Length: 42 (0x2A) - SSLHandshake: SSL HandShake ServerHello(0x02) HandShakeType: ServerHello(0x02) Length: 38 (0x26) - ServerHello: 0x1 + Version: TLS 1.0 + RandomBytes: SessionIDLength: 0 (0x0) TLSCipherSuite: TLS_RSA_WITH_AES_256_CBC_SHA { 0x00, 0x35 } CompressionMethod: 0 (0x0) - TlsRecordLayer: TLS Rec Layer-2 HandShake: ContentType: HandShake: - Version: TLS 1.0 Major: 3 (0x3) Minor: 1 (0x1) Length: 654 (0x28E) - SSLHandshake: SSL HandShake Certificate(0x0B) HandShakeType: Certificate(0x0B) Length: 650 (0x28A) - Cert: 0x1 CertLength: 647 (0x287) - Certificates: CertificateLength: 644 (0x284) - X509Cert: Issuer: nimbuzz.com,Nimbuzz,NL, Subject: nimbuzz.com,Nimbuzz,NL + SequenceHeader: - TbsCertificate: Issuer: nimbuzz.com,Nimbuzz,NL, Subject: nimbuzz.com,Nimbuzz,NL + SequenceHeader: + Tag0: + Version: (2) + SerialNumber: -1018418383 + Signature: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - Issuer: nimbuzz.com,Nimbuzz,NL - RdnSequence: nimbuzz.com,Nimbuzz,NL + SequenceOfHeader: 0x1 + Name: NL + Name: Nimbuzz + Name: nimbuzz.com + Validity: From: 02/22/10 20:22:32 UTC To: 02/20/20 20:22:32 UTC + Subject: nimbuzz.com,Nimbuzz,NL - SubjectPublicKeyInfo: RsaEncryption (1.2.840.113549.1.1.1) + SequenceHeader: + Algorithm: RsaEncryption (1.2.840.113549.1.1.1) - SubjectPublicKey: - AsnBitStringHeader: - AsnId: BitString type (Universal 3) - LowTag: Class: (00......) Universal (0) Type: (..0.....) Primitive TagValue: (...00011) 3 - AsnLen: Length = 141, LengthOfLength = 1 LengthType: LengthOfLength = 1 Length: 141 bytes BitString: + Tag3: + Extensions: - SignatureAlgorithm: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - SequenceHeader: - AsnId: Sequence and SequenceOf types (Universal 16) + LowTag: - AsnLen: Length = 13, LengthOfLength = 0 Length: 13 bytes, LengthOfLength = 0 + Algorithm: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - Parameters: Null Value - Sha1WithRSAEncryption: Null Value + AsnNullHeader: - Signature: - AsnBitStringHeader: - AsnId: BitString type (Universal 3) - LowTag: Class: (00......) Universal (0) Type: (..0.....) Primitive TagValue: (...00011) 3 - AsnLen: Length = 129, LengthOfLength = 1 LengthType: LengthOfLength = 1 Length: 129 bytes BitString: + TlsRecordLayer: TLS Rec Layer-3 HandShake:

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  • How to get an array to work with oops concepts in Perl

    - by superstar
    Hello guys, I need some help regarding the arrays in Perl This is the constructor i have. sub new { my $class = shift; my @includeobjects = (); my @excludeobjects = (); my $Packet = { _PacketName => shift, _Platform => shift, _Version => shift, @_IncludePath => @includeobjects, }; bless $Packet, $class; return $Packet; } sub SetPacketName { my ( $Packet, $PacketName ) = @_; $Packet->{_PacketName} = $PacketName if defined($PacketName); return $Packet->{_PacketName}; } sub SetIncludePath { my ( $Packet, @IncludePath ) = @_; $Packet->{@_IncludePath} = @IncludePath; return $Packet->{@_IncludePath}; } sub GetPacketName { my( $Packet ) = @_; return $Packet->{_PacketName}; } sub GetIncludePath { my( $Packet ) = @_; return $Packet->{@_IncludePath}; } The get and set methods work fine for PacketName. But since IncludePath is an array, I could not get it work. The declaration is what i am not able to get right Any suggestions please...

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  • What are the attack vectors for passwords sent over http?

    - by KevinM
    I am trying to convince a customer to pay for SSL for a web site that requires login. I want to make sure I correctly understand the major scenarios in which someone can see the passwords that are being sent. My understanding is that at any of the hops along the way can use a packet analyzer to view what is being sent. This seems to require that any hacker (or their malware/botnet) be on the same subnet as any of the hops the packet takes to arrive at its destination. Is that right? Assuming some flavor of this subnet requirement holds true, do I need to worry about all the hops or just the first one? The first one I can obviously worry about if they're on a public Wifi network since anyone could be listening in. Should I be worried about what's going on in subnets that packets will travel across outside this? I don't know a ton about network traffic, but I would assume it's flowing through data centers of major carriers and there's not a lot of juicy attack vectors there, but please correct me if I am wrong. Are there other vectors to be worried about outside of someone listening with a packet analyzer? I am a networking and security noob, so please feel free to set me straight if I am using the wrong terminology in any of this.

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  • How do I use an array as an object attribute in Perl?

    - by superstar
    Hello guys, I need some help regarding the arrays in Perl This is the constructor i have. sub new { my $class = shift; my @includeobjects = (); my @excludeobjects = (); my $Packet = { _PacketName => shift, _Platform => shift, _Version => shift, @_IncludePath => @includeobjects, }; bless $Packet, $class; return $Packet; } sub SetPacketName { my ( $Packet, $PacketName ) = @_; $Packet->{_PacketName} = $PacketName if defined($PacketName); return $Packet->{_PacketName}; } sub SetIncludePath { my ( $Packet, @IncludePath ) = @_; $Packet->{@_IncludePath} = @IncludePath; return $Packet->{@_IncludePath}; } sub GetPacketName { my( $Packet ) = @_; return $Packet->{_PacketName}; } sub GetIncludePath { my( $Packet ) = @_; return $Packet->{@_IncludePath}; } The get and set methods work fine for PacketName. But since IncludePath is an array, I could not get it work. The declaration is what I am not able to get right.

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  • Track IP Messenger's chatting by wireshark

    - by Kumar P
    We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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  • redirect all youtube video requests to a specific one

    - by iTayb
    I'm on an IT team in my company and I would like to block youtube to users. I don't want to just deny access to the whole youtube domain, but only to replace the .flv/.mp4 request with the one that I want. That way, if someone tries to watch youtube videos on the network, He'll get a video of why using our expensive bandwidth for pleasure is a no-no. I thought about using a packet manipulation program and just replace the video ID with something that I want, but I didn't manage to do it right.

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  • Get active network interface on Windows

    - by Kevin Walzer
    I'm developing an application that provides a UI to windump, the packet sniffer. Windump has a "-D" parameter that lists all network interfaces it can find, and then you can specify which interface to listen on. However, I'd like to avoid forcing the user to manually configure which interface to listen on. On Unix, I can obtain the right network interface (en0, en1, etc.) via a call to ifconfig and some parsing of the output, but I cannot locate any equivalent Windows API or command that can yield similar information--ipconfig doesn't seem to obtain this data. Can anyone suggest either a Windows command-line tool or an API that can be called via VBScript to obtain this data so that I don't have to present the user with a dialog in my GUI telling them to select the right interface?

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  • Altq limits not being applied to UDP transfers

    - by overkordbaever
    I have a OpenBSD server acting as a router/firewall with yhr packet filter ruleset shown below, a linux server, and a linux client. When transferring files (using netcat) by TCP, the limits are applied (for example the 100mbit limit in the example), though when transferring data by UDP, the limits aren't applied; the file always takes the same amount of time no matter the queue bandwidth limit I set (I can even turn off the queues completely, and will still get the same result). Why aren't the queuing rules applied to UDP packages? The rules used: #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low I suppose this may be related a question I've previously asked, though since it's more of a separate question, I suppose a separate question should be used for this

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  • Why are some UDP packets getting blocked?

    - by Tom
    In our organization, we have two test machines running Windows XP. While attempting to test a roll-my-own UDP message server, I found that both could receive small messages (under 2k) just fine. However, when I test sending large packets to both of these machines, one receives them fine, while the other can't receive them at all. Both machines have SP3 and both have their Windows Firewall shut off, but one still isn't working. Can anyone tell me where to look for anything that might be blocking or limiting the packet size on a Windows Machine? Thanks.

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