Peter
Author Archives: Peter
Author Archives: Peter
sflow {The diagram above illustrates how the Host sFlow agent is able to efficiently monitor and classify traffic. In this case both the Host sFlow agent and an Apache web server are are running as services managed by systemd. A network connection , shown in Continue reading
collector { ip = 10.0.0.70 }
pcap { dev = eth0 }
systemd { markTraffic = on }
tcp { }
}
var api = 'https://endpoints.office.com/endpoints/worldwide';
function uuidv4() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
var reqid = uuidv4();
function updateAddressMap() {
var res, i, ips, id, groups;
try { res = http(api+'?clientrequestid='+reqid); }
catch(e) { logWarning('request failed ' + e); }
if(res == null) return;
res = JSON.parse(res);
groups Continue reading
ovs-vsctl -- --id=@sflow create sflow agent=$OVS_BR target=$IP_CONTROLLER_1 sampling=100 polling=10 -- set bridge $OVS_BR sflow=@sflowReboot the switch for the changed to take effect.
bcm_asic_host_entries 4
bcm_host_entries_max 8192
bcm_ipv4_entries 0
bcm_ipv4_entries_max 0
bcm_ipv6_entries 0
bcm_ipv6_entries_max 0
bcm_ipv4_ipv6_entries 9
bcm_ipv4_ipv6_entries_max 16284
bcm_long_ipv6_entries 3
bcm_long_ipv6_entries_max 256
bcm_total_routes 10
bcm_total_routes_max 32768
bcm_ecmp_nexthops 0
bcm_ecmp_nexthops_max 2016
bcm_mac_entries 3
bcm_mac_entries_max 32768
bcm_ipv4_neighbors 4
bcm_ipv6_neighbors 0
bcm_ipv4_routes 0
bcm_ipv6_routes 0
bcm_acl_ingress_entries Continue reading
BCMLT.0> lt list -d MIRROR_PORT_ENCAP_SFLOW
MIRROR_PORT_ENCAP_SFLOW
Description: The MIRROR_PORT_ENCAP_SFLOW logical table is used to specify
per-port sFlow encapsulation sample configuration.
11 fields (1 key-type field):
SAMPLE_ING_FLEX_RATE
Description: Sample ingress flex sFlow packet if the generated sFlow random
number is greater than the threshold. A lower threshold leads to
higher sampling frequency.
SAMPLE_EGR_RATE
Description: Sample egress sFlow packet if the generated sFlow random number is
greater than the threshold. A lower threshold leads to
higher sampling frequency.
SAMPLE_ING_RATE
Description: Sample ingress sFlow packet if the generated sFlow random number is
greater than the threshold. A lower threshold leads to
higher sampling frequency.
SAMPLE_ING_FLEX_MIRROR_INSTANCE
Description: Enable to copy ingress flex sFlow packet samples to the ingress
mirror member using the sFlow mirror instance configuration.
SAMPLE_ING_FLEX_CPU
Description: Enable to copy ingress flex Continue reading
var user = 'onos';
var password = 'rocks';
var onos = '192.168.123.1';
var controls = {};
setFlow('udp_reflection',
{keys:'ipdestination,udpsourceport',value:'frames'});
setThreshold('udp_reflection_attack',
{metric:'udp_reflection',value:100,byFlow:true,timeout:2});
setEventHandler(function(evt) {
// don't consider inter-switch links
var link = topologyInterfaceToLink(evt.agent,evt.dataSource);
if(link) return;
// get port information
var port = topologyInterfaceToPort(evt.agent,evt.dataSource);
if(!port) return;
// need OpenFlow info to create ONOS filtering rule
if(!port.dpid || !port.ofport) return;
// we already have Continue reading
sudo mn --custom ~/onos/tools/dev/mininet/onos.py,sflow-rt/extras/sflow.py \The screen capture above shows the network topology in the ONOS web user interface.
--link tc,bw=10 --controller onos,1 --topo tree,2,2
mininet-onos> iperf h1 h3The screen capture above shows top flows, busiest Continue reading
baselineCreate(name,window,sensitivity,repeat);Where:
var status = baselineCheck(name,value);Where:
sudo mn --custom=sflow-rt/extras/sflow.py --link tc,bw=10 \In the screen capture above you can clearly see the large flow traversing switches, s4, s3, s2, s1, s9, s13, and s15 in a tree topology. The network was created using the following command:
--topo torus,3,3 --switch ovsbr,stp=1 --test iperf
sudo mn --custom sflow-rt/extras/sflow.py --link tc,bw=10 \The screen capture above shows a large flow traversing switches s1, s2, s3, and s4 in a linear topology. The network was created using the following command:
--topo tree,depth=4,fanout=2 --test iperf
sudo mn --custom sflow-rt/extras/sflow.py --link tc,bw=10 \It's also easy to create Custom Topologies. The following command creates the example custom topology, topo-2sw-2host.py, that ships with Mininet:
--topo linear,4 --test iperf
sudo mn --custom ~/mininet/custom/topo-2sw-2host.py,sflow-rt/extras/sflow.py Continue reading
<?php
header('Content-Type: text/plain');
if(isset($_GET['labels'])) {
$keys = htmlspecialchars($_GET["labels"]);
}
$vals = htmlspecialchars($_GET["values"]);
if(isset($keys)) {
$cols = $keys.','.$vals;
} else {
$cols = $vals;
}
$key_arr = explode(",",$keys);
$result = file_get_contents('http://localhost:8008/table/ALL/'.$cols.'/json');
$obj = json_decode($result,true);
foreach ($obj as $row) {
unset($labels);
foreach ($row as $cell) {
if(!isset($labels)) {
$labels = 'agent="'.$cell['agent'].'",datasource="'.$cell['dataSource'].'"';
}
$name = $cell['metricName'];
$val = $cell['metricValue'];
if(in_array($name,$key_arr)) {
$labels .= Continue reading
wget --no-check-certificate https://github.com/sflow/host-sflow/releases/download/v2.0.17-1/hsflowd-opx_2.0.17-1_amd64.debThe sFlow agent requires very little configuration, automatically monitoring all switch ports using the following default settings:
sudo dpkg -i hsflowd-opx_2.0.17-1_amd64.deb
Link Speed | Sampling Rate | Polling Continue reading |
---|
curl -X PUT -H 'Content-Type:application/json' --data '["[iptables]","-A FORWARD --in-interface swp+ -d 10.10.100.10 -p udp --sport 53 -j DROP"]' -k -u 'cumulus:CumulusLinux!' https://10.0.0.52:8080/acl/ddos1ACLs are sent as a JSON encoded array of strings. Each string will be written as a line in a file stored under /etc/cumulus/acl/policy.d/ - See Cumulus Linux: Netfilter - ACLs. For example, the rule above will be written to the file 50rest-ddos1.rules with the following Continue reading