Sawubona. Lokhu kusho ukuthi kunenethiwekhi yamakhasimende angu-5k. Muva nje kwavela umzuzu ongemnandi kakhulu - phakathi nendawo yenethiwekhi sine-Brocade RX8 futhi yaqala ukuthumela amaphakethe amaningi angaziwa-unicast, njengoba inethiwekhi ihlukaniswe ngama-vlans - lokhu akuyona ingxenye inkinga, KODWA kukhona ama-vlan akhethekile amakheli amhlophe, njll. futhi zelulelwe kuzo zonke izinhlangothi zenethiwekhi. Ngakho-ke manje cabanga ngokugeleza okungenayo okuya ekhelini leklayenti elingafundi njengomfundi wasemngceleni futhi lokhu kugeleza kundiza kubheke kusixhumanisi somsakazo esiya endaweni ethile (noma yonke) - isiteshi sivalekile - amaklayenti athukuthele - ukudabuka...
Umgomo uwukuguqula isiphazamisi sibe isici. Bengicabanga ngibheke ku-q-in-q nge-vlan yeklayenti egcwele, kodwa zonke izinhlobo zehadiwe njenge-P3310, lapho i-dot1q inikwe amandla, iyeka ukuvumela i-DHCP ukuthi idlule, futhi abazi ukuthi bangakhetha kanjani i-qinq kanye nabaningi. izingibe ezinjalo. Yini i-ip-unnambered futhi isebenza kanjani? Kafushane kakhulu: ikheli lesango + umzila kusixhumi esibonakalayo. Ngomsebenzi wethu, sidinga: ukusika isibumbeko, sisabalalise amakheli kumakhasimende, sengeze imizila kumakhasimende ngokusebenzisa izixhumanisi ezithile. Ukwenza kanjani konke lokhu? I-Shaper - lisg, dhcp - db2dhcp kumaseva amabili azimele, i-dhcprelay isebenza eziphakelini zokufinyelela, i-ucarp iphinde isebenze kumaseva okufinyelela - ukwenza isipele. Kodwa indlela yokwengeza imizila? Ungakwazi ukwengeza yonke into kusengaphambili ngombhalo omkhulu - kodwa lokhu akulona iqiniso. Ngakho sizokwenza udondolo lokuzibhalela.
Ngemva kokusesha ku-inthanethi, ngithole umtapo wezincwadi osezingeni eliphezulu we-C++, okuvumela ukuthi uhogele kahle ithrafikhi. I-algorithm yohlelo olungeza imizila ilandelayo - silalela izicelo ze-arp kusixhumi esibonakalayo, uma sinekheli ku-interface ye-lo kuseva eceliwe, bese sengeza umzila ngokusebenzisa lesi sikhombimsebenzisi bese wengeza i-arp emile. rekhoda kule-ip - ngokuvamile, amakhophi ambalwa, isiphawulo esincane futhi usuqedile
Imithombo 'yerutha'
#include <stdio.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <tins/tins.h>
#include <map>
#include <iostream>
#include <functional>
#include <sstream>
using std::cout;
using std::endl;
using std::map;
using std::bind;
using std::string;
using std::stringstream;
using namespace Tins;
class arp_monitor {
public:
void run(Sniffer &sniffer);
void reroute();
void makegws();
string iface;
map <string, string> gws;
private:
bool callback(const PDU &pdu);
map <string, string> route_map;
map <string, string> mac_map;
map <IPv4Address, HWAddress<6>> addresses;
};
void arp_monitor::makegws() {
struct ifaddrs *ifAddrStruct = NULL;
struct ifaddrs *ifa = NULL;
void *tmpAddrPtr = NULL;
gws.clear();
getifaddrs(&ifAddrStruct);
for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr) {
continue;
}
string ifName = ifa->ifa_name;
if (ifName == "lo") {
char addressBuffer[INET_ADDRSTRLEN];
if (ifa->ifa_addr->sa_family == AF_INET) { // check it is IP4
// is a valid IP4 Address
tmpAddrPtr = &((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
} else if (ifa->ifa_addr->sa_family == AF_INET6) { // check it is IP6
// is a valid IP6 Address
tmpAddrPtr = &((struct sockaddr_in6 *) ifa->ifa_addr)->sin6_addr;
inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
} else {
continue;
}
gws[addressBuffer] = addressBuffer;
cout << "GW " << addressBuffer << " is added" << endl;
}
}
if (ifAddrStruct != NULL) freeifaddrs(ifAddrStruct);
}
void arp_monitor::run(Sniffer &sniffer) {
cout << "RUNNED" << endl;
sniffer.sniff_loop(
bind(
&arp_monitor::callback,
this,
std::placeholders::_1
)
);
}
void arp_monitor::reroute() {
cout << "REROUTING" << endl;
map<string, string>::iterator it;
for ( it = route_map.begin(); it != route_map.end(); it++ ) {
if (this->gws.count(it->second) && !this->gws.count(it->second)) {
string cmd = "ip route replace ";
cmd += it->first;
cmd += " dev " + this->iface;
cmd += " src " + it->second;
cmd += " proto static";
cout << cmd << std::endl;
cout << "REROUTE " << it->first << " SRC " << it->second << endl;
system(cmd.c_str());
cmd = "arp -s ";
cmd += it->first;
cmd += " ";
cmd += mac_map[it->first];
cout << cmd << endl;
system(cmd.c_str());
}
}
for ( it = gws.begin(); it != gws.end(); it++ ) {
string cmd = "arping -U -s ";
cmd += it->first;
cmd += " -I ";
cmd += this->iface;
cmd += " -b -c 1 ";
cmd += it->first;
system(cmd.c_str());
}
cout << "REROUTED" << endl;
}
bool arp_monitor::callback(const PDU &pdu) {
// Retrieve the ARP layer
const ARP &arp = pdu.rfind_pdu<ARP>();
if (arp.opcode() == ARP::REQUEST) {
string target = arp.target_ip_addr().to_string();
string sender = arp.sender_ip_addr().to_string();
this->route_map[sender] = target;
this->mac_map[sender] = arp.sender_hw_addr().to_string();
cout << "save sender " << sender << ":" << this->mac_map[sender] << " want taregt " << target << endl;
if (this->gws.count(target) && !this->gws.count(sender)) {
string cmd = "ip route replace ";
cmd += sender;
cmd += " dev " + this->iface;
cmd += " src " + target;
cmd += " proto static";
// cout << cmd << std::endl;
/* cout << "ARP REQUEST FROM " << arp.sender_ip_addr()
<< " for address " << arp.target_ip_addr()
<< " sender hw address " << arp.sender_hw_addr() << std::endl
<< " run cmd: " << cmd << endl;*/
system(cmd.c_str());
cmd = "arp -s ";
cmd += arp.sender_ip_addr().to_string();
cmd += " ";
cmd += arp.sender_hw_addr().to_string();
cout << cmd << endl;
system(cmd.c_str());
}
}
return true;
}
arp_monitor monitor;
void reroute(int signum) {
monitor.makegws();
monitor.reroute();
}
int main(int argc, char *argv[]) {
string test;
cout << sizeof(string) << endl;
if (argc != 2) {
cout << "Usage: " << *argv << " <interface>" << endl;
return 1;
}
signal(SIGHUP, reroute);
monitor.iface = argv[1];
// Sniffer configuration
SnifferConfiguration config;
config.set_promisc_mode(true);
config.set_filter("arp");
monitor.makegws();
try {
// Sniff on the provided interface in promiscuous mode
Sniffer sniffer(argv[1], config);
// Only capture arp packets
monitor.run(sniffer);
}
catch (std::exception &ex) {
std::cerr << "Error: " << ex.what() << std::endl;
}
}iskripthi sokufakwa kwe-libtins
#!/bin/bash
git clone https://github.com/mfontanini/libtins.git
cd libtins
mkdir build
cd build
cmake ../
make
make install
ldconfig
Yala ukwakha kanambambili
g++ main.cpp -o arp-rt -O3 -std=c++11 -lpthread -ltinsUngayethula kanjani?
start-stop-daemon --start --exec /opt/ipoe/arp-routes/arp-rt -b -m -p /opt/ipoe/arp-routes/daemons/eth0.800.pid -- eth0.800
Yebo - izowakha kabusha amatafula ngokusekelwe kusignali ye-HUP. Kungani ungasebenzisi i-netlink? Ubuvila nje futhi iLinux iyiskripthi esibhalweni - ngakho konke kuhamba kahle. Yebo, imizila iyimizila, yini elandelayo? Okulandelayo, sidinga ukuthumela imizila ekulesi seva emngceleni - lapha, ngenxa yehadiwe efanayo ephelelwe yisikhathi, sithathe indlela yokumelana okuncane - sabela lo msebenzi ku-BGP.
bgp configigama lomethuleli *******
iphasiwedi *******
ifayela lokungena /var/log/bgp.log
!
Inombolo ye-AS, amakheli namanethiwekhi amanga
router bgp 12345
bgp irutha-id 1.2.3.4
ukusabalalisa kabusha kuxhunyiwe
sabalalisa kabusha i-static
umakhelwane 1.2.3.1 ukude-njengoba 12345
umakhelwane 1.2.3.1 next-hop-self
umakhelwane 1.2.3.1 imephu yomzila akukho phakathi
umakhelwane 1.2.3.1 ukuphuma kwemephu yomzila
!
imvume yokuthekelisa yohlu lokufinyelela 1.2.3.0/24
!
imvume yokuthekelisa imephu yomzila 10
fanisa ukuthekelisa kwekheli le-IP
!
Ukuthekelisa kwemephu yomzila phika 20
Asiqhubeke. Ukuze iseva iphendule ezicelweni ze-arp, kufanele unike amandla ummeleli we-arp.
echo 1 > /proc/sys/net/ipv4/conf/eth0.800/proxy_arp
Masiqhubeke - ucarp. Sibhala imibhalo yokuqalisa lesi simangaliso ngokwethu.
Isibonelo sokusebenzisa i-daemon eyodwa
start-stop-daemon --start --exec /usr/sbin/ucarp -b -m -p /opt/ipoe/ucarp-gen2/daemons/$iface.$vhid.$virtualaddr.pid -- --interface=eth0.800 --srcip=1.2.3.4 --vhid=1 --pass=carpasword --addr=10.10.10.1 --upscript=/opt/ipoe/ucarp-gen2/up.sh --downscript=/opt/ipoe/ucarp-gen2/down.sh -z -k 10 -P --xparam="10.10.10.0/24"
phezulu.sh
#!/bin/bash
iface=$1
addr=$2
gw=$3
vlan=`echo $1 | sed "s/eth0.//"`
ip ad ad $addr/32 dev lo
ip ro add blackhole $gw
echo 1 > /proc/sys/net/ipv4/conf/$iface/proxy_arp
killall -9 dhcrelay
/etc/init.d/dhcrelay zap
/etc/init.d/dhcrelay start
killall -HUP arp-rt
phansi.sh
#!/bin/bash
iface=$1
addr=$2
gw=$3
ip ad d $addr/32 dev lo
ip ro de blackhole $gw
echo 0 > /proc/sys/net/ipv4/conf/$iface/proxy_arp
killall -9 dhcrelay
/etc/init.d/dhcrelay zap
/etc/init.d/dhcrelay start
Ukuze i-dhcprelay isebenze kusixhumi esibonakalayo, idinga ikheli. Ngakho-ke, ezindaweni esizisebenzisayo sizofaka amakheli angakwesokunxele - isibonelo 10.255.255.1/32, 10.255.255.2/32, njll. Ngeke ngikutshele ukuthi ungamisa kanjani i-relay - konke kulula.
Ngakho yini esinayo? Ikhophi yasenqolobaneni yamasango, ukulungiswa okuzenzakalelayo kwemizila, i-dhcp. Lena isethi encane - i-lisg iphinde igoqe yonke into eduze kwayo futhi sesivele sine-shaper. Kungani yonke into inde kangaka futhi idida? Akulula yini ukuthatha i-accel-pppd nokusebenzisa i-pppoe ngokuphelele? Cha, akulula - abantu abakwazi ukufaka i-patchcord kumzila, ingasaphathwa eye-pppoe. I-accel-ppp yinto emnandi - kodwa ayizange isisebenzele - kunamaphutha amaningi kukhodi - iyabhidlika, isika ngokugwegwile, futhi into edabukisa kakhulu ukuthi uma ikhanya - abantu badinga ukulayisha kabusha. yonke into - amafoni abomvu - awazange asebenze nhlobo. Iyini inzuzo yokusebenzisa i-ucarp esikhundleni se-keelifelived? Yebo, kukho konke - kunamasango ayi-100, agcinwe futhi iphutha elilodwa ku-config - konke akusebenzi. Isango elingu-1 alisebenzi ne-ucarp. Mayelana nokuvikeleka, bathi abasele bazobhalisa amakheli ngokwabo futhi bawasebenzise ekwabelaneni - ukulawula lesi sikhathi, simisa ukuhlolwa kwe-dhcp-snooping + source-guard + arp kuwo wonke ama-switch/olts/base. Uma iklayenti lingenayo i-dhpc kodwa emile - uhlu lokufinyelela echwebeni.
Kungani kwenziwa konke lokhu? Ukucekela phansi ithrafikhi engadingeki. Manje inkinobho ngayinye ine-vlan yayo futhi engaziwa-unicast ayisasabi, ngoba idinga kuphela ukuya echwebeni elilodwa hhayi kubo bonke ... Yebo, imiphumela emibi iyilungiselelo lemishini elijwayelekile, ukusebenza kahle okukhulu ekwabeni indawo yekheli.
Indlela yokumisa i-lisg iyisihloko esihlukile. Izixhumanisi zamalabhulali zinamathiselwe. Mhlawumbe lokhu okungenhla kuzosiza othile ekufinyeleleni izinhloso zakhe. Inguqulo yesi-6 ayikasetshenziswa kunethiwekhi yethu okwamanje - kodwa kuzoba nenkinga - kunezinhlelo zokubhala kabusha i-lisg yenguqulo yesi-6, futhi kuzodingeka ukuthi kulungiswe uhlelo olungeza imizila.
Source: www.habr.com