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Questions tagged [packet-mangling]

9 questions
14
votes
2 answers

Packet mangling utilities besides iptables?

I'm looking for a linux utility that can alter the payloads of network packets based on a set of rules. Ideally, I'd use iptables and the netfilter kernel module, but they don't support generic payload mangling: iptables will alter various header…
Adam Liss
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2 answers

Python port forwarding/multiplexing server

I would like to make server that listen on UDP port 162 (SNMP trap) and then forwards this traffic to multiple clients. Also important is that the source port & address stays same (address spoofing). I guess that best tool for this would be Twisted…
Ib33X
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4
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1 answer

Forcing packet loss

For testing purposes, to determine how a protocol implementation behaves in the presence of packet loss, I would like to force packet loss on one of my network devices. Specifically, I would like to be able to tune the packet loss anywhere between…
Confusion
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4
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1 answer

Packet modification with netfilter queue?

I'm currently trying to use codes with libnetfilter_queue in userspace to modify packets that were queued in the NFQUEUE target in iptables. However I have little idea as to how to go about doing it. I have set it to copy the packet with…
user849336
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2 answers

Library to Perform Link-Layer Packet Modification

Is there a library out there that will allow me to perform link-layer packet modification for both incoming and outgoing packets? Basically I want to do some transformations to a packet (for eg. changing IP payload) based on incoming MAC address, IP…
TripShock
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Can Winsock LSP on a router modify forwarded packets?

If a Windows machine acts like a router (gateway) for others, will Winsock LSP filters that are installed on it be able to capture/mangle traffic of those machines? If no, which technologies are there for this?
hamstergene
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1 answer

LSP packet modify

anybody care to share some insights on how to use LSP for packet modifying ? I am using the non IFS subtype and I can see how (pseudo?) packets first enter WSPRecv. But how do I modify them ? My inquiry is about one single HTTP response that causes…
kellogs
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netfilter_queue ipv4 optional header removal

I'm implementing netfilter_queue-based user program that deletes ipv4 optional header 'Time Stamp' ping works well with this program, because it uses ICMP transmission. But TCP-based applications doesn't work. I've checked it with wireshark, and…
CStriker
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4 answers

Issue reading packets from a pcap file. dpkt module. What gives?

I am running the following test script to try to read packets from a sample .pcap file I have downloaded. It won't seem to run. I have all of the modules, but no examples seem to be running. import socket import dpkt import sys pcapReader =…
Chris
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