{"id":91646,"date":"2020-08-16T07:42:09","date_gmt":"2020-08-16T05:42:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1"},"modified":"2020-08-16T07:42:09","modified_gmt":"2020-08-16T05:42:09","slug":"kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","title":{"rendered":"Ako rie\u0161i\u0165 probl\u00e9my s dom\u00e1cim IPsec VPN. \u010cas\u0165 1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Ako
\n<\/p>\n

Situ\u00e1cia<\/h3>\n

\nOdchod\u00edm. Pijem k\u00e1vu. \u0160tudent nastavil VPN pripojenie medzi dvoma bodmi a zmizol. Kontrolujem: tunel naozaj existuje, ale v tuneli nie je \u017eiadny prenos. Na telefon\u00e1ty \u0161tudent neodpoved\u00e1.<\/p>\n

Zapa\u013eujem kanvicu a zaober\u00e1m sa troubleshootingom C-Terra Gateway. Zdie\u013eam svoje sk\u00fasenosti a metodol\u00f3giu.
\n<\/a><\/noindex><\/p>\n

Vstupn\u00e9 d\u00e1ta<\/h3>\n

\nDve geograficky oddelen\u00e9 lokality s\u00fa prepojen\u00e9 GRE tunelom. GRE je potrebn\u00e9 za\u0161ifrova\u0165:<\/p>\n

\"Ako
\n
\nKontrolujem funk\u010dnos\u0165 GRE tunela. Za t\u00fdmto \u00fa\u010delom sp\u00fa\u0161\u0165am ping z zariadenia R1 na GRE rozhranie zariadenia R2. Toto je cie\u013eov\u00fd prenos na za\u0161ifrovanie. Odpove\u010f nie je:<\/p>\n

root@R1:~# ping 1.1.1.2 -c 4\nPING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.\n\n--- 1.1.1.2 ping statistics ---\n4 packets transmitted, 0 received, 100% packet loss, time 3057ms<\/code><\/pre>\n
\nPozer\u00e1m logy na Gate1 a Gate2. Log s rados\u0165ou oznamuje, \u017ee IPsec tunel bol \u00faspe\u0161ne nadviazan\u00fd, \u017eiadne probl\u00e9my:<\/p>\n
root@Gate1:~# cat \/var\/log\/cspvpngate.log\nAug  5 16:14:23 localhost  vpnsvc: 00100119  IPSec connection 5 established, traffic selector 172.17.0.1->172.16.0.1, proto 47, peer 10.10.10.251, id \"10.10.10.251\", Filter \nIPsec:Protect:CMAP:1:LIST, IPsecAction IPsecAction:CMAP:1, IKERule IKERule:CMAP:1<\/code><\/pre>\n
\nV \u0161tatistik\u00e1ch IPsec tunela na Gate1 vid\u00edm, \u017ee tunel naozaj existuje, ale \u010d\u00edta\u010d Rcvd je nulovan\u00fd:<\/p>\n
root@Gate1:~# sa_mgr show\nISAKMP sessions: 0 initiated, 0 responded\n\nISAKMP connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) State Sent Rcvd\n1 3 (10.10.10.251,500)-(10.10.10.252,500) active 1070 1014\n\nIPsec connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) Protocol Action Type Sent Rcvd\n1 3 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 480 0<\/code><\/pre>\n
\nTr\u00e1blem s C-Terra takto: h\u013ead\u00e1m, kde sa str\u00e1caj\u00fa cie\u013eov\u00e9 pakety na ceste od R1 do R2. Po\u010das procesu (spojler) objav\u00edm chybu.<\/p>\n
Troubleshooting<\/h3>\n
\nKrok 1. \u010co dost\u00e1va Gate1 od R1<\/b><\/p>\n
Pou\u017e\u00edvam vstavan\u00fd paketov\u00fd sniffer \u2013 tcpdump. Sp\u00fa\u0161\u0165am sniffer na vn\u00fatornom (Gi0\/1 v Cisco-like not\u00e1cii alebo eth1 v Debian OS not\u00e1cii) rozhran\u00ed:<\/p>\n
root@Gate1:~# tcpdump -i eth1\n\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\nlistening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes\n14:53:38.879525 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 1, length 64\n14:53:39.896869 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 2, length 64\n14:53:40.921121 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 3, length 64\n14:53:41.944958 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 4, length 64<\/code><\/pre>\n
\nVid\u00edm, \u017ee Gate1 dost\u00e1va od R1 GRE pakety. Pokra\u010dujem \u010falej.<\/p>\n
Krok 2. \u010co Gate1 rob\u00ed s GRE paketami<\/b><\/p>\n
S\u00fa\u010das\u0165ou klogview sa pozer\u00e1m, \u010do sa deje s GRE paketami vo vn\u00fatri VPN<\/a> C-Terra ovl\u00e1da\u010da:<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nfiltration result for out packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: chain 4 \"IPsecPolicy:CMAP\", filter 8, event id IPsec:Protect:CMAP:1:LIST, status PASS\nencapsulating with SA 31: 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0\npassed out packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: encapsulated\n<\/code><\/pre>\n
\nVid\u00edm, \u017ee cie\u013eov\u00fd GRE prenos (proto 47) 172.16.0.1 -> 172.17.0.1 pre\u0161iel (PASS) pod pravidlo \u0161ifrovania LIST v kryptoplete CMAP a bol za\u0161ifrovan\u00fd (encapsulated). N\u00e1sledne bol paket smerovan\u00fd (passed out). Odpovedaj\u00faci prenos nie je vo v\u00fdstupe klogview.<\/p>\n
Kontrolujem pr\u00edstupov\u00e9 zoznamy na zariaden\u00ed Gate1. Vid\u00edm jeden pr\u00edstupov\u00fd zoznam LIST, ktor\u00fd definuje cie\u013eov\u00fd prenos na \u0161ifrovanie, to znamen\u00e1, \u017ee pravidl\u00e1 M\u00c9 nie s\u00fa nastaven\u00e9:<\/p>\n
Gate1#show access-lists\nExtended IP access list LIST\n    10 permit gre host 172.16.0.1 host 172.17.0.1<\/code><\/pre>\n
\nV\u00fdstup: probl\u00e9m nie je na zariaden\u00ed Gate1.<\/p>\n
\u010eal\u0161ie inform\u00e1cie o klogview<\/b><\/p>\n
VPN ovl\u00e1da\u010d spracov\u00e1va v\u0161etok sie\u0165ov\u00fd prenos, nielen ten, ktor\u00fd by sa mal \u0161ifrova\u0165. Tieto spr\u00e1vy s\u00fa vidite\u013en\u00e9 v klogview, ak VPN ovl\u00e1da\u010d spracoval sie\u0165ov\u00fd prenos a odovzdal ho v neza\u0161ifrovanom stave:<\/p>\n
root@R1:~# ping 172.17.0.1 -c 4<\/code><\/pre>\n
<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nfiltration result for out packet 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: chain 4 \"IPsecPolicy:CMAP\": no match\npassed out packet 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: filtered<\/code><\/pre>\n
\nVid\u00edm, \u017ee ICMP prenos (proto 1) 172.16.0.1->172.17.0.1 nepre\u0161iel (no match) do pravidiel \u0161ifrovania kryptopletu CMAP. Paket bol smerovan\u00fd (passed out) v otvorenom stave.<\/p>\n
Krok 3. \u010co dost\u00e1va Gate2 od Gate1<\/b><\/p>\n
Sp\u00fa\u0161\u0165am sniffer na WAN (eth0) rozhran\u00ed Gate2:<\/p>\n
root@Gate2:~# tcpdump -i eth0\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\nlistening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes\n16:05:45.104195 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x1), length 140\n16:05:46.093918 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x2), length 140\n16:05:47.117078 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x3), length 140\n16:05:48.141785 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x4), length 140<\/code><\/pre>\n
\nVid\u00edm, \u017ee Gate2 dost\u00e1va ESP pakety od Gate1.<\/p>\n
Krok 4. \u010co rob\u00ed Gate2 s ESP paketmi<\/b><\/p>\n
Sp\u00fa\u0161\u0165am utilitu klogview na Gate2:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nfiltration result for in packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: chain 17 \"FilterChain:L3VPN\", filter 21, status DROP\ndropped in packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: firewall\n<\/code><\/pre>\n
\nVid\u00edm, \u017ee ESP pakety (proto 50) boli odhoden\u00e9 (DROP) pravidlom (L3VPN) firewalla. Uis\u0165ujem sa, \u017ee k Gi0\/0 je naozaj priraden\u00fd pr\u00edstupov\u00fd zoznam L3VPN:<\/p>\n
Gate2#show ip interface gi0\/0\nGigabitEthernet0\/0 is up, line protocol is up\n  Internet address is 10.10.10.252\/24\n  MTU is 1500 bytes\n  Outgoing access list is not set\n  Inbound  access list is L3VPN<\/code><\/pre>\n
\nProbl\u00e9m som odhalil.<\/p>\n
Krok 5. \u010co nie je v poriadku so zoznamom pr\u00edstupu
\n<\/b>
\nPozer\u00e1m sa, \u010do predstavuje pr\u00edstupov\u00fd zoznam L3VPN:<\/p>\n
Gate2#show access-list L3VPN\nExtended IP access list L3VPN\n    10 permit udp host 10.10.10.251 any eq isakmp\n    20 permit udp host 10.10.10.251 any eq non500-isakmp\n    30 permit icmp host 10.10.10.251 any<\/code><\/pre>\n
\nVid\u00edm, \u017ee ISAKMP pakety s\u00fa povolen\u00e9, tak\u017ee sa vytv\u00e1ra IPsec tunel. Ale pravidlo povolenia pre ESP ch\u00fdba. Zjavne si \u0161tudent pom\u00fdlil icmp a esp.<\/p>\n
Opravenie pr\u00edstupov\u00e9ho zoznamu:<\/p>\n
Gate2(config)#\nip access-list extended L3VPN\nno 30\n30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nKrok 6. Kontrola funk\u010dnosti<\/b><\/p>\n
Najprv sa ubezpe\u010d\u00edm, \u017ee pr\u00edstupov\u00fd zoznam L3VPN je spr\u00e1vny:<\/p>\n
Gate2#show access-list L3VPN\nExtended IP access list L3VPN\n    10 permit udp host 10.10.10.251 any eq isakmp\n    20 permit udp host 10.10.10.251 any eq non500-isakmp\n    30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nTeraz sp\u00fa\u0161\u0165am cie\u013eov\u00fd traffic z zariadenia R1:<\/p>\n
root@R1:~# ping 1.1.1.2 -c 4\nPING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.\n64 bytes from 1.1.1.2: icmp_seq=1 ttl=64 time=35.3 ms\n64 bytes from 1.1.1.2: icmp_seq=2 ttl=64 time=3.01 ms\n64 bytes from 1.1.1.2: icmp_seq=3 ttl=64 time=2.65 ms\n64 bytes from 1.1.1.2: icmp_seq=4 ttl=64 time=2.87 ms\n\n--- 1.1.1.2 ping statistics ---\n4 packets transmitted, 4 received, 0% packet loss, time 3006ms\nrtt min\/avg\/max\/mdev = 2.650\/10.970\/35.338\/14.069 ms<\/code><\/pre>\n
\nV\u00ed\u0165azstvo. GRE tunel sa vytvoril. \u010c\u00edslo prich\u00e1dzaj\u00faceho trafficu v \u0161tatistike IPsec nie je nulov\u00e9:<\/p>\n
root@Gate1:~# sa_mgr show\nISAKMP sessions: 0 initiated, 0 responded\n\nISAKMP connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) State Sent Rcvd\n1 3 (10.10.10.251,500)-(10.10.10.252,500) active 1474 1350\n\nIPsec connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) Protocol Action Type Sent Rcvd\n1 4 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 1920 480<\/code><\/pre>\n
\nNa br\u00e1ne Gate2 sa vo v\u00fdstupe klogview objavili spr\u00e1vy, \u017ee cie\u013eov\u00fd traffic 172.16.0.1->172.17.0.1 bol \u00faspe\u0161ne (PASS) de\u0161ifrovan\u00fd (decapsulated) pravidlom LIST v kryptokarte CMAP:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nfiltration result for in packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: chain 18 \"IPsecPolicy:CMAP\", filter 25, event id IPsec:Protect:CMAP:1:LIST, status PASS\npassed in packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: decapsulated<\/code><\/pre>\n
\nZhrnutie<\/b><\/p>\n
\u0160tudent naru\u0161il v\u00fdstup. 
\nD\u00e1vajte pozor na pravidl\u00e1 M\u00c9.<\/p>\n
Anonymn\u00fd in\u017einier
\nt.me\/anonimous_engineer<\/i>
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
\u0421\u0438\u0442\u0443\u0430\u0446\u0438\u044f \u0412\u044b\u0445\u043e\u0434\u043d\u043e\u0439. \u041f\u044c\u044e \u043a\u043e\u0444\u0435. \u0421\u0442\u0443\u0434\u0435\u043d\u0442 \u043d\u0430\u0441\u0442\u0440\u043e\u0438\u043b VPN \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043c\u0435\u0436\u0434\u0443 \u0434\u0432\u0443\u043c\u044f \u0442\u043e\u0447\u043a\u0430\u043c\u0438 \u0438 \u0438\u0441\u0447\u0435\u0437. \u041f\u0440\u043e\u0432\u0435\u0440\u044f\u044e: \u0442\u0443\u043d\u043d\u0435\u043b\u044c \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0435\u0441\u0442\u044c, \u043d\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0432 \u0442\u0443\u043d\u043d\u0435\u043b\u0435 \u043d\u0435\u0442. \u041d\u0430 \u0437\u0432\u043e\u043d\u043a\u0438 \u0441\u0442\u0443\u0434\u0435\u043d\u0442 \u043d\u0435 \u043e\u0442\u0432\u0435\u0447\u0430\u0435\u0442. \u0421\u0442\u0430\u0432\u043b\u044e \u0447\u0430\u0439\u043d\u0438\u043a \u0438 \u043f\u043e\u0433\u0440\u0443\u0436\u0430\u044e\u0441\u044c \u0432 \u0442\u0440\u0430\u0431\u043b\u0448\u0443\u0442\u0438\u043d\u0433 \u0421-\u0422\u0435\u0440\u0440\u0430 \u0428\u043b\u044e\u0437. \u0414\u0435\u043b\u044e\u0441\u044c \u0441\u0432\u043e\u0438\u043c \u043e\u043f\u044b\u0442\u043e\u043c \u0438 \u043c\u0435\u0442\u043e\u0434\u043e\u043b\u043e\u0433\u0438\u0435\u0439. \u0418\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0414\u0432\u0435 \u0442\u0435\u0440\u0440\u0438\u0442\u043e\u0440\u0438\u0430\u043b\u044c\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u043b\u043e\u0449\u0430\u0434\u043a\u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u044b GRE \u0442\u0443\u043d\u043d\u0435\u043b\u0435\u043c. GRE \u043d\u0443\u0436\u043d\u043e \u0437\u0430\u0448\u0438\u0444\u0440\u043e\u0432\u0430\u0442\u044c: \u041f\u0440\u043e\u0432\u0435\u0440\u044f\u044e \u0440\u0430\u0431\u043e\u0442\u043e\u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c GRE […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":91647,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-91646","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ako rie\u0161i\u0165 probl\u00e9my s dom\u00e1cim IPsec VPN. \u010cas\u0165 1 | ProHoster","description":"Situ\u00e1cia 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