The network-traffic tag has no wiki summary.
0
votes
2answers
144 views
SYN packets sent from one server but never arrives at destination
I am troubleshooting network problems for a client, remotely. The problem they have is that they get "connection timed out" occasionally between a web server and and a back-end search server. They can ...
1
vote
1answer
104 views
Detecting a host doing a port sweep across multiple interfaces/networks
I'm trying to set up a honey-pot like machine that would detect port sweeps from multiple networks with multiple interfaces.
As an illustration, if I could set up a box with eth1, eth2 and eth3.
...
0
votes
1answer
331 views
log openvpn traffic by squid
is any way to log openvpn traffic (sites that users visited)?
i think because openvpn use tunnel and encrypt traffic cannot log visited websites, but in a server i saw that open vpn's users traffic ...
2
votes
0answers
182 views
Varnish running out of open ports, lots of SYN_SENT connections
Recently we've been experiencing issues with our Varnish (3x) -> Apache (3x) setup, resulting in a huge spike in SYN_SENT connections.
The spike itself is due to the amount of new traffic hitting the ...
2
votes
0answers
167 views
curl request results in heavy load on the server
We consume an XML Datafeed by sending cURL requests to the provider's server. They do not allow us to cache, so each pageview is a new cURL request. Twice this year, our server has crashed with the ...
0
votes
0answers
100 views
iptables configuration to block unwanted traffic on specific MAC addresses
I want to block all Skype,Facetime, VOIP traffic on a MAC address. My approach is to block all ports from 450 to 65535 and this is my commandline:
iptables -A INPUT -p tcp -destination-port 450:65535 ...
0
votes
0answers
36 views
Imbalance between DNS query and response rates
The following figures shows the rate of UDP DNS queries and responses of a traffic passing a router. DNS query is a DNS packet with query/response flag set to 0 in header and DNS response the one with ...
0
votes
0answers
87 views
why iftop and wget's transfer status varied so much?
the transfer speed is 2147kb/s now
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
29 ...
