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Enthusiast of networking and systems, happy hacking

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Enthusiast of networking and systems, happy hacking
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# use polipo to connect to ss server locally, and support polipo listen under 8123.
git config --global http.proxy http://127.0.0.1:8123
HTTP_PROXY=http://127.0.0.1:8123 go get X
git config --global --unset http.proxy
# Encap this to override the issue because fucking GFW block google sites...
@fortitudepub
fortitudepub / gist:a062169a7e625deb6931d5ef49613842
Created February 23, 2017 07:55
network provision shell script.
#!/bin/bash
ROUTER_ID="f2c8e7a4-ce7f-41cb-8c92-6e85a3453e57"
NS="qrouter-$ROUTER_ID"
LOG="/data/log/neutron/$NS-manual.log"
TIME=`date`
echo "Manual provision of $NS started at $TIME." > $LOG
# VLAN tag which is allocated by network admin.
package main
import "golang.org/x/tour/pic"
import "math/rand"
func Pic(dx, dy int) [][]uint8 {
// Initial zero.
s := make([][]uint8, 0)
for i:=0;i<dy;i++ {
v := make([]uint8, dx)
@fortitudepub
fortitudepub / gist:ad3be9419782c454012c12985f3807e8
Last active February 8, 2017 10:52
shell generate routes
#!/bin/sh
i=1
while (( i <= 100000 ))
do
echo "generate route $i ..."
c2=$(( (i/(255*255))%255 ))
c3=$(( (i/255)%255 ))
c4=$(( i%255))
function string_ops:string (val) %{
strlcpy (STAP_RETVALUE, (char*)STAP_ARG_val, MAXSTRINGLEN);
%}
probe kernel.function("udp_gro_receive") {
if (cpu() == 0) {
printf("udp_gro_receive %d %s(%d/%d) %s %d, %d, %d\n", gettimeofday_us(), execname(), pid(), cpu(), $$vars, $skb->ip_summed, @cast($skb->cb, "struct napi_gro_cb")->csum_cnt, @cast($skb->cb, "struct napi_gro_cb")->csum_valid);
print_backtrace();
}
}
#################################################
# Sample OpenVPN 2.0 config file for #
# multi-client server. #
# #
# This file is for the server side #
# of a many-clients <-> one-server #
# OpenVPN configuration. #
# #
# OpenVPN also supports #
# single-machine <-> single-machine #
@fortitudepub
fortitudepub / gist:2baf1bb8f06c5956e701e837d276928c
Created December 23, 2016 08:51
Scala actor with pcap thread send packet to itself.
package com.netease.cns.proton.agent.dhcp
import akka.actor.{Actor, ActorLogging}
import com.netease.cns.proton.agent.dhcp.DHCPPktRxActor.PcapRxPacket
import org.pcap4j.core.PcapNetworkInterface.PromiscuousMode
import org.pcap4j.core.Pcaps
import org.pcap4j.packet.Packet
object DHCPPktRxActor {
// TODO: define a packet which will be processed by each NetworkDHCPActor.
@fortitudepub
fortitudepub / gist:be8618f595dbfacc503e043a3887e181
Created September 9, 2016 07:58
ovs simple nat extracted from system-traffic.at
# ns0
ip netns del natns0
ip netns add natns0
ip netns exec natns0 ip link set lo up
ip link add natp0 type veth peer name natp0p
ip link set natp0 netns natns0
ip link set natp0p up
ip netns exec natns0 ip link set natp0 up
ip netns exec natns0 ip link set natp0 address 80:88:88:88:88:88
ip netns exec natns0 ip addr add 10.1.1.1/24 dev natp0
@fortitudepub
fortitudepub / gist:3e46295512b437af901aa3d4e7cd7824
Created August 29, 2016 08:19
onliner to check all host command result by ssh remote
cat hostlist | grep compute | awk '{print $2}' | xargs -I X > all_drops.txt 2>&1 ssh X -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 1046 source check-qdisc.sh
BTW:
using the same command while using SCP to upload the script to each host.
@fortitudepub
fortitudepub / gist:138e49779c99ec9f96c45e8a10a1d17b
Created August 17, 2016 02:30
onliner to transform nova hypervisors to ip address.
nova host-list | grep compute | awk '{print $2}' | sed 's/-/\./g'