Questions tagged [packet]
97 questions
2
votes
1 answer
Transportation Layer vs Network Layer
I am a networking student, and I am learning about the OSI system for networks. The concepts for this system are all pretty complicated, but the main issue that I'm having is the main differences between the Networking Layer and the Transportation…
Dillon Knight
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2
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1 answer
PF: Block all, but one subnet firewall rule?
I'm trying to do something that I thought would be relatively simple: Block all the traffic to a test server, other than my company's subnet.
I've tried things along these lines (111.111.0.0 is my placeholder for this example), but only the block…
ballofpopculture
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2
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1 answer
TCP Sequence & Acknowledgment numbers
I have looked through other questions on here involving the relevant topics, but I am still not clear on this.
I have just been reading this explanation of TCP sequence & acknowledgment numbers.
About half-way down there is this diagram:
Near the…
Totem
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2
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3 answers
Is TCP header the same as TCP segment?
So, is a TCP header actually the same thing as a TCP segment? I was reading this page,
where it reads near the end that:
Even though it might seem they are, in most cases, when referring to
the TCP header, we are talking about the header without…
Totem
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2
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0 answers
Redhat 6.4 configured to log Martian packets but is not logging ll header
I am trying to investigate the source of martian packets I have been seeing on several servers connected to the same subnet. The logging of martian packets has been enabled in /etc/sysctl.conf.
However when viewing the entries in /var/log/messages…
Shoulynn
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2
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1 answer
10GbE be2net low pktgen performance
I am testing the network performance of two workstations, each having 2.4GHz Xeon quad core processors and NC550SFP PCIe Dual Port 10GbE Server Adapters, linked back to back.
I've checked the bandwidth of the RAM, which is ~12Gbps, so no bottleneck…
mrg2k8
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2
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2 answers
Tracking actual packet path on a LAN
Is it possible to track the path a packet takes on a switched network. When I run a traceroute I get only the router and the destination. I know for a fact, however, that the packet must pass through at least one switch and then be broadcast on a…
November
2
votes
1 answer
Check what the average packet size is in a network (what firewall/router should I get)
Is there any way to do this?
We are looking into buying a Fortigate 100D but are unsure if it will hold up to our requirements.
http://www.fortinet.com/products/fortigate/100D.html
While the firewall throughput at 1518 Bytes looks great (2.5 Gbps),…
Mint
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1 answer
Inaccurate bandwidth limiting in altq queues
I'm setting up an environment where I have one Linux server, one OpenBSD router and one Linux client and I want to be able to limit how much bandwidth the client should be able to use.
I've been performing these tests with "netcat" and "time" (using…
user42511
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1
vote
1 answer
Performing tasks and custom logic on network packets
I'm looking for a way to process packets in a Linux server in a particular fashion - I need to run some custom logic on every packet, then (possibly) take some actions on the packets and let the kernel route it as it wants. My use specific use cases…
FitzChivalry
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1 answer
IPTables or alternate solution to block the first attempt to connect then allow further attempts from same IP
I have a unique situation in which a DDOS attack for a certain game is sending realistic player connection packets that seem to perfectly mimic a real player's connection packet.
These typically cycle through what looks to be thousands of IPs,…
1
vote
2 answers
Openvpn fails behind firewall but another VPN Works
Well I have spent last 48 hours trying to debug this but I'm about to give up now.
Mobile carrier in our country has a daily social bundle in which we can use ONLY whatsapp, facebook and snapchat & twitter unlimited.
All other domains and IPs are in…
Umar Hayat
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1
vote
1 answer
How to send outgoing TCP packets on Windows through a remote Linux server?
Let's say I have a Windows computer and a Linux server. I'm looking for a way to route outgoing TCP packets on the Windows computer (all ports) through the Linux server.
The Linux server would have something like Ettercap to modify those packets…
Pacnet
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1
vote
1 answer
Understanding SoftEther VPN packet log
Help me to identify each part of a packet log from softether VPN.
for example, the below given is a packet…
Arun Xavier
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0 answers
Route HTTP packets into tun/tap interface
What I simply want is to redirect all HTTP packet from any interface to my tun/tap interface. A scapy script will listen on this interface and do some treatments to these packets.
First, I created a tun/tap interface:
sudo ip tuntap add mode tap…
Duke Nukem
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