Edit capture files editcap is a general-purpose utility for modifying capture files.
Additionaly, you can add, remove and edit By using the --enet-dmac and --enet-smac options you can specify what the new destination and source MAC addresses should be respectively. The following would cause all traffic to have a destination MAC of So what if you have bi-directional traffic that you want to send through a router who's MAC addresses are We'll assume the client is AC and the server is Well first you would need a tcpprep cache file which splits the traffic.
Once you have that, you would run tcprewrite like this: One very useful flag to keep in mind is --skipbroadcast which causes tcprewrite to skip rewriting MAC addresses which are broadcast FF: FF or multicast first octet is odd.
Both can be set using this plugin: There are a number of methods for rewriting IP addresses depending on your needs. When enabling a layer 3 rewrite rule, tcprewrite will automagically re-calculate checksums for you, so there is no need to pass --fixcsum.
When specifying IPv6 addresses, wrap the address in hard brackets like so: Forcing Traffic Between Two Hosts Sometimes you have a pcap with a bunch of hosts and you want rewrite all the traffic to be between two hosts or "endpoints".
You can choose the IP addresses like Randomizing IP Addresses If you have a pcap that you want to give someone else without revealing your IP addresses, then this may be what you're looking for.
Note that this feature only handles IP headers and ARP messages; it does not modify application data which may contain your original IP address as well.
When IP addresses are randomized, it is done in a deterministic manner, based on the seed value you provide, so that sessions between two hosts are maintained. Using different seed values results in different values for the IP addresses for the same input pcap.
It allows you to map IP addresses in one subnet to IP addresses in another subnet. Each source and destination subnet is expressed in CIDR notation, and needn't be the same size.
You can specify multiple CIDR pairs and use the --pnat flag twice if you use a cache file. You could also rewrite IP's differently depending on the direction of the packet: The result is that both source and destination IP's will be remapped properly to maintain the session.
Whenever you edit the layer 4 data of a packet, tcprewrite will automatically recalculate the appropriate checksums.
One example may be to change all the HTTP traffic to run over port instead of In the Charts box of the ribbon, click on the Insert Pie Chart icon to open the drop down list of available chart types. Hover your mouse pointer over a chart type to read a description of the chart.
Click on 3-D Pie to select the three dimensional pie chart and add it to the worksheet. Tcprewrite is a tool to rewrite packets stored in pcap(3) file format, such as crated by tools such as tcpdump(1) and ethereal(1). Once a pcap file has had it's packets rewritten, they can be replayed back out on the network using tcpreplay(1).
tcprewrite also allows you to add or remove q VLAN tag information from ethernet frames. to make sure we have enough room for the ethernet and IPv4 headers.
Of course, this won't help any non-IP frames, so you may have some packets which can't be sent in some situations. Fragroute. In my embedded Linux device I want to find the source of Ethernet broadcast storm and flash the led once I detected the ethernet broadcast storm.
Script to add multiple ips for different NIC in single linux machine. I supposed that tcprewrite will linux networking ip pcap. asked Oct 17 at red0ct. 5. 1. vote. 1answer To add page numbers, click Insert Page Number, Insert Total Page Count, or both.
To add the current date or time, click Insert Current Date, Insert Current Time, or both. To add the file name, click Insert File Name. To add a graphic, click Insert Picture.
Ethernet II framing is the most common in Ethernet local area networks, due to its simplicity and lower overhead. In order to allow some frames using Ethernet v2 framing and some using the original version of framing to be used on the same Ethernet segment, EtherType values must be greater than or equal to (0x).