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2
votes
0answers
91 views

Apache Instance in Private Subnet not returning packets

How can we get the Apache instance in a private subnet to work? Configuration Public subnet with 1 NAT instance Private subnet with 1 App instance Details 1. Masquerading is turned on NAT on via ...
0
votes
1answer
39 views

How can I tell what's happening to my packets?

I'm trying to bring up a little box on my network. I just reflashed the firmware and it's supposed to come up as 192.168.1.1 by default. My router is a DSL modem at 192.168.0.1; it usually uses a ...
2
votes
1answer
98 views

Tcpdump on ec2 not seeing all packets

I'm running tcpdump on an Amazon EC2 instance to monitor HTTP traffic going to Nginx (this is just a test box, the only resource is the example test page). Running tcpdump with the command # ...
0
votes
1answer
18 views

How to specify packets in traceroute? [closed]

I reading the manual pages for help, but I didn't find a parameter that allows you to specify how many packets to send with the program? Would appreciate tips from you guys, thanks!
0
votes
1answer
101 views

Windows XP procedurally drop packets [closed]

We have a need in our office network to procedurally drop incoming packets on an Windows XP machine acting as a server. By procedurally we mean to drop a percentage of packets incoming to the XP ...
1
vote
0answers
46 views

PHP-FPM slowlog and Mysql lost connection

I was having an issue with PHP-FPM and mysql. When I needed to process an input file that would generate several selects/inserts/updates for each line, it would stop after approximately 60s with ...
3
votes
1answer
234 views

Need help understanding capturing from Wireshark?

I am having issues with my FTP servers. Connecting, sending and receiving fail sometimes, and it is not consistent. I manage to capture and filter by IP the packets, I just need pointers on what can ...
1
vote
2answers
36 views

What do other nodes do with a switch's packets the first time the packets are sent out? [closed]

I'm a total newbie here and don't know much of anything about Routing and switching, Servers and the like.. so my questions might seem very newbie but please bare with me. When it comes to Switches ...
4
votes
1answer
263 views

How does an Access Point handle broadcast packets from the wired side?

I have an Cisco AP 1242AG autonomous AP connected to L2 switches. Let's say I have 100 wired devices each sending 2 broadcast UDP packets per second. Obviously these packets will reach the Access ...
1
vote
1answer
306 views

Percona: Got an error writing communication packets

Since a few days, two of our php-applications (symfony2) are reporting the following errors in mysql-logs: [Warning] Aborted connection 253 to db: '$appname' user: '$appname' host: 'localhost' (Got ...
0
votes
1answer
17 views

Is there a way to explicitly set the maximum number of packets tcpdump will capture before terminating?

We have a small script that essentially does the following: A) Capture packets using tcpdump and pipe to output file. B) Run our own clean + sort script on output file. C) Display results using | ...
0
votes
1answer
479 views

tcpdump: can't create rx ring on packet socket: Cannot allocate memory

I've been using tcpdump without any issues before this error popped up. I use the following two commands with variations as soon as my server is attacked so the packets automatically get dumped if the ...
5
votes
2answers
6k views

ifconfig eth0 RX dropped packets

The problem The ifconfig command shows more and more dropped packets in the RX section. So, there seem to be a problem to some packets arriving from the Internet to my server. The questions What ...
2
votes
1answer
514 views

is there such a thing as “too many packets per second”?

we have 2 offices in separate buildings. there is an ethernet link between the two. The link is provided by the company that manages one of the buildings, and they provide us with 100Mbps bandwidth ...
1
vote
2answers
1k views

F5 Packet filtering or iRules or both?

I need to set-up a custom filter for a virtual host that requires both ip address checks and URL check. Like so: _if_ _(_ http-request matches url _and_ ip is from certain host/net range _)_ ...
2
votes
2answers
142 views

Wireshark and mirrored ports bringing in 10k+ packets a second

I've got wireshark setup on a monitoring machine to monitor our offices internet traffic (approx 40 machines). However, whenever I start wireshark within about 30-40 seconds it has crashed - I think ...
1
vote
0answers
247 views

Duplicate syn packets sent from Windows server 2003 sp2

My pc is running Windows server 2003 sp2. Whenever I establish an internet connection (e.g., with internet explorer to google.com), my host sends the syn packet twice. It is (probably not) a ...
1
vote
1answer
282 views

iptables/haproxy limit packets per second

Is it possible to limit incoming tcp packets per second (or bytes per second) with iptables or haproxy? I have found many examples but none of them seem to work.
0
votes
1answer
311 views

irqbalance on linux and dropped packets

I am investigating dropped packets on a dual core, quad XEON box running Linux. One thing I see is irqbalance running on the system. I have a couple of questions. Reading the docs here I think I ...
2
votes
4answers
285 views

Reject all mail packages on all ports (outgoing) on Ubuntu

I just had a problem with our ISP; our internet connection was blocked because there was to much mail being send from our ip. The problem is that we all use gmail and that no mail is being send ...
4
votes
2answers
650 views

How do I fake dropped packets (or actually make them fail)?

Background One of our clients suffers from an intermittant problem with their internet where it will drop packets when a user downloads a large file (their IT is looking into the problem). I have ...
1
vote
0answers
129 views

Can someone give me advice on these rules to prevent DDOS where fragmented packets are sent without the initial SYN fragment ?

iptables -N NEW_TCP_PACKETS_NO_SYN iptables -A INPUT NEW_TCP_PACKETS_NO_SYN -p tcp ! --syn -m state --state NEW -m limit --limit 10/day -j LOG --log-prefix "New packets but not syn:" iptables ...
1
vote
1answer
343 views

Mysteriously dropped packets

I have server with Broadcom Corporation NetXtreme II BCM5706 Gigabit Ethernet chips, and 2.6.18-164.2.1.el5 kernel from Red Hat Enterprise Linux Server release 5.4 (Tikanga). During normal work day ...
1
vote
0answers
473 views

High count packets rejects in established connections because of timestamp

I am trying to set up a Wowza media server using a Dell R710 with 24GB memory and a 10Gbit connection and all the calculations say it should be able to handle around 20k connections however when I get ...
2
votes
4answers
3k views

My computer is sending ICMP packets to arbitrary destinations

My computer is sending ICMP packets to arbitrary destinations. I can't understand the reason. Dump of one of the packet is : Internet Control Message Protocol Type: 3 (Destination unreachable) ...
0
votes
3answers
272 views

In Linux, how do I send packets of a certain size to an IP?

What commands can you run? (must be via the terminal)