Dotaz: VPN a vadne routovani

[Leoš Literák]

Ahoj,

nastavil jsem si doma VPN do firmy pres OpenSwan 2.2. a IPSec (kernel 2.6). Zda se, ze to jede, do site se pripojim, muzu stahovat data ze site. Problem je, ze ve chvili, kde nahodim /etc/init.d/ipsec start, tak prestane fungovat vsechno ostatni. Nedostanu se na zadny server mimo VPN, ani si nepingnu. Hlasi to, ze sit neni dostupna. Asi problem v routovani?

Diky za vase napady

Odpovědi

[Leoš Literák]

jeste bych dodal routovaci tabulky, treba nekdo v nich najde problem. Me prijdou zmatene.

pred ipsec:

62.245.92.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         62.245.92.1     0.0.0.0         UG    0      0        0 eth1

po ipsec:

62.245.92.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.0.0.0        62.245.92.1     255.255.0.0     UG    0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         62.245.92.1     128.0.0.0       UG    0      0        0 eth1
128.0.0.0       62.245.92.1     128.0.0.0       UG    0      0        0 eth1
0.0.0.0         62.245.92.1     0.0.0.0         UG    0      0        0 eth1

[Dejv]

Jenom to odhaduji, ale vidim tam dvakrat cil 0.0.0.0. Nevim, jak v linuxu, ale v oknech je tohle default routa. Presne stejny problem jsem taky resil, a problem byl prave v tom, ze jsem tam mel vickrat tu "default" routu.

Pokud kecam, tak sorry

Dejv.

[Leoš Literák]

Take si rikam, ze ta routovaci tabulka vypada divne. Bohuzel toto neni muj obor a tak nevim, jak to spravit.

Kolega mi jeste rikal, ze mam zkusit vypnout ifplugd, ze ostatnim to jede i pod 2.6 kernelem v pohode.

[Dejv]

man route

Mel by tam (asi) byt jenom jeden radek, ktery zacina 0.0.0.0.

Podrobneji musi poradit nekdo jiny, do siti taky moc nevidim

P.S.

toto neni muj obor

Holt kazdy jsme na neco jineho. Nekdo na elektroniku, nekdo na ABCLinuxu

Dejv.

[Leoš Literák]

no jo, ale jak je smazat?

[root@leos root]# route del -net 62.245.92.1 netmask 0.0.0.0
SIOCDELRT: Invalid argument
[root@leos root]# route del -net 62.245.92.1
SIOCDELRT: Invalid argument
[root@leos root]# route del -net 128.0.0.0
SIOCDELRT: Invalid argument

[Dejv]

Pomuze route del 0.0.0.0 netmask 128.0.0.0 eth1 ?

[Leoš Literák]

route: síťová maska 7fffffff nedává smysl, když cílem je cesty počítač

nepomuze

[Dejv]

A route del -net 0.0.0.0 netmask 128.0.0.0 eth1 ?

Ale fakt hadam.

Dejv

[Leoš Literák]

Konecne spravna syntaxe Diky.

Poodstranoval jsem, co se dalo, ale stale to nejede. Po kazdem smazani jsem testoval sit. Finalni stav, kde jsem prestal mazat, je:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
62.245.92.0     *               255.255.255.0   U     0      0        0 eth1
default         62.245.92.1     0.0.0.0         UG    0      0        0 eth1

Kdyz zkusim pinknout abicko (skrze zkratku v /etc/hosts)

[literakl@leos bin]$ ping a
connect: Resource temporarily unavailable

Proste eth1 posila data jen na VPN. Kernel je 2.6.8.1-12mdk. V logu najdu toto:

Feb 23 13:09:41 leos ipsec_setup: KLIPS ipsec0 on eth1 62.245.92.148/255.255.255.0 broadcast 62.245.92.255
Feb 23 13:09:41 leos ipsec_setup: ...Openswan IPsec started
Feb 23 13:09:41 leos ipsec_setup: Starting Openswan IPsec U2.2.0/K2.6.8.1-12mdk...
Feb 23 13:09:43 leos ipsec__plutorun: 104 "literakl" #1: STATE_MAIN_I1: initiate
Feb 23 13:09:43 leos ipsec__plutorun: ...could not start conn "literakl"

a auth.log obsahuje:

Feb 23 14:15:25 leos ipsec__plutorun: Starting Pluto subsystem...
Feb 23 14:15:25 leos pluto[28356]: Starting Pluto (Openswan Version 2.2.0 X.509-1.5.4 PLUTO_USES_KEYRR)
Feb 23 14:15:25 leos pluto[28356]:   including NAT-Traversal patch (Version 0.6c) [disabled]
Feb 23 14:15:25 leos pluto[28356]: ike_alg_register_enc(): Activating OAKLEY_AES_CBC: Ok (ret=0)
Feb 23 14:15:25 leos pluto[28356]: Using Linux 2.6 IPsec interface code
Feb 23 14:15:25 leos pluto[28356]: Changing to directory '/etc/openswan/ipsec.d/cacerts'
Feb 23 14:15:25 leos pluto[28356]:   loaded CA cert file 'cacert.pem' (1490 bytes)
Feb 23 14:15:25 leos pluto[28356]: Could not change to directory '/etc/openswan/ipsec.d/aacerts'
Feb 23 14:15:25 leos pluto[28356]: Could not change to directory '/etc/openswan/ipsec.d/ocspcerts'
Feb 23 14:15:25 leos pluto[28356]: Could not change to directory '/etc/openswan/ipsec.d/crls'
Feb 23 14:15:25 leos pluto[28356]: added connection description "packetdefault"
Feb 23 14:15:25 leos pluto[28356]: added connection description "block"
Feb 23 14:15:26 leos pluto[28356]: added connection description "clear-or-private"
Feb 23 14:15:26 leos pluto[28356]: added connection description "clear"
Feb 23 14:15:26 leos pluto[28356]:   loaded host cert file '/etc/openswan/ipsec.d/clcert.pem' (1777 bytes)
Feb 23 14:15:26 leos pluto[28356]: added connection description "literakl"
Feb 23 14:15:26 leos pluto[28356]: added connection description "private-or-clear"
Feb 23 14:15:26 leos pluto[28356]: added connection description "private"
Feb 23 14:15:26 leos pluto[28356]: listening for IKE messages
Feb 23 14:15:26 leos pluto[28356]: adding interface eth1/eth1 62.245.92.148
Feb 23 14:15:26 leos pluto[28356]: adding interface lo/lo 127.0.0.1
Feb 23 14:15:26 leos pluto[28356]: loading secrets from "/etc/openswan/ipsec.secrets"
Feb 23 14:15:26 leos pluto[28356]:   loaded private key file 
'/etc/openswan/ipsec.d/private/privatekey.pem' (1118 bytes)
Feb 23 14:15:26 leos pluto[28356]: loading group "/etc/openswan/ipsec.d/policies/private"
Feb 23 14:15:26 leos pluto[28356]: loading group "/etc/openswan/ipsec.d/policies/private-or-clear"
Feb 23 14:15:26 leos pluto[28356]: loading group "/etc/openswan/ipsec.d/policies/clear"
Feb 23 14:15:26 leos pluto[28356]: loading group "/etc/openswan/ipsec.d/policies/clear-or-private"
Feb 23 14:15:26 leos pluto[28356]: loading group "/etc/openswan/ipsec.d/policies/block"
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: initiating Main Mode
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: transition from state STATE_MAIN_I1 to state STATE_MAIN_I2
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: I am sending my cert
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: I am sending a certificate request
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: transition from state STATE_MAIN_I2 
to state STATE_MAIN_I3
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: Peer ID is
 ID_DER_ASN1_DN: 'C=US, ST=Massachusetts, L=Cambridge,OU=Networks, CN=xx.com'
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: no crl from 
issuer "C=US, ST=Massachusetts, L=Cambridge, XX CA Root" found (strict=no)
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: transition from state STATE_MAIN_I3 to state STATE_MAIN_I4
Feb 23 14:15:27 leos pluto[28356]: "literakl" #1: ISAKMP SA established
Feb 23 14:15:27 leos pluto[28356]: "literakl" #2: initiating Quick Mode 
RSASIG+ENCRYPT+TUNNEL+PFS+UP {using isakmp#1}
Feb 23 14:15:27 leos pluto[28356]: "literakl" #2: transition from state STATE_QUICK_I1 
to state STATE_QUICK_I2
Feb 23 14:15:27 leos pluto[28356]: "literakl" #2: sent QI2, IPsec SA established {ESP=>0x0a7821cc <0x9b26d182}
Feb 23 14:15:38 leos pluto[28356]: %hold otherwise handled during 
DNS lookup for Opportunistic Initiation for 62.245.92.148 to 2
05.188.8.244

[Dejv]

No, ono by asi celkem prospelo, kdyby bylo k dispozici "schema" site (mam na mysli IP adresy pocitacu/siti, bavime se o eth1, co eth0? atd.).

Rekl bych, ze ted tam toho je zas trochu malo. Minimalne

127.0.0.0 * 255.0.0.0 U 0 0 0 lo

mi tam chybi.

[Leoš Literák]

po vypnuti ifplugd (v mandrake 10.1 schovano pod Rychle pripojeni do site) vypada routovaci tabulka takhle:

Směrovací tabulka v jádru pro IP
Adresát         Brána           Maska           Přízn Metrik Odkaz  Užt Rozhraní
62.245.92.0     *               255.255.255.0   U     0      0        0 eth1
10.0.0.0        62.245.92.1     255.255.0.0     UG    0      0        0 eth1
default         62.245.92.1     128.0.0.0       UG    0      0        0 eth1
128.0.0.0       62.245.92.1     128.0.0.0       UG    0      0        0 eth1
default         62.245.92.1     0.0.0.0         UG    0      0        0 eth1

To uz mi prijde jako pokrok Nicmene to stale nejede. Asi si zacnu hrat a mazat jednotliva pravidla, treba jedna kombinace zacne fungovat.

[Zdenek Pizl]

Zdar,

128.0.0.0 62.245.92.1 128.0.0.0 UG 0 0 0 eth1

co to je? tenhke radek je hodne divnej. Jeste bych veril tomu, ze tam bude routa na 127.0.0.1, ale uz ne, ze povede pres eth1 ...

Videl bych to jako kandidata na odstraneni ...

z.p.

[Leoš Literák]

Pokracovani na tuto reakci

Schema site. No domaci PC zapojene pres eth1 do internetu skrze kabelovku. eth0 neni pouzivano. VPN sedi na adrese siti 10.0.0.0.

Naposledy jsem upravil routovaci tabulku do stejne podoby jako je bez IPSEC, ale nepomohlo to.

[root@leos root]# route -n
Směrovací tabulka v jádru pro IP
Adresát         Brána           Maska           Přízn Metrik Odkaz  Užt Rozhraní
62.245.92.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         62.245.92.1     0.0.0.0         UG    0      0        0 eth1

[root@leos root]# ping a
connect: Resource temporarily unavailable

Uz si zacinam myslet, ze chyba v routovani nebude. Ze ten IPSec tam provadi neco divneho.

[jm]

Hele a fakt to musi byt IPSec + OpenSWAN? Takova OpenVPN jede na prvni pokus.

[Leoš Literák]

Ja jsem jen uzivatel snazici se pripojit do firemni site dle navodu poskytnuteho adminem.

V jinych distribucich to jede v pohode, treba SuSE jsem na notasovi ohnul. Bohuzel notebook uz nemam a tak nemuzu zjistovat, jake jsou rozdily v nastaveni. A stejne by to byl desny opruz kvuli omezeni MAC adres u UPC.

[Michal Kubeček]

S jádrem 2.6 bych dal před OpenS/WAN přednost použití nativních nástrojů (racoon, setkey), které lépe odpovídají implementaci IPSec v jádře. Dobrý návod je například součástí LARTC howto.

Tedy přesněji: ne dal bych, ale dávám

[sizmo]

Zdravim, tento problem jak popisujes sem mel taky a chyba neni v routovani ale v nastaveni IPSECu. Kdyztak sem hod svuj konfigurak. Mrknu na to.

[Leoš Literák]

$ cat /etc/openswan/ipsec.conf

version 2.0

# basic configuration
config setup
    interfaces=%defaultroute
    klipsdebug=none
    plutodebug=none
    uniqueids=yes
    nat_traversal=no
    virtual_private=%v4:192.168.2.0/24,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:10.0.0.0/8,%v4:!10.0.0.0/24,%v4:!10.0.10.0/24,%v
4:!10.0.20.0/24,%v4:!10.0.50.0/24,%v4:!10.0.40.0/24,%v4:!192.168.33.0/24
    forwardcontrol=yes

conn %default
    authby=rsasig
    rightrsasigkey=%cert
    leftrsasigkey=%cert
    disablearrivalcheck=no
    keyingtries=2
    pfs=yes

conn literakl
    authby=rsasig
    leftrsasigkey=%cert
    rightrsasigkey=%cert
    keyingtries=5
    disablearrivalcheck=no
    rightid="C=US,ST=Massachusetts,L=Cambridge,O=XXX,OU=Networks,CN=goblin.xxx.com"
    right=194.XXX.203.154
    rightsubnet=10.0.0.0/16
    rightnexthop=194.XXX.203.153
    rightfirewall=yes
    left=%defaultroute
    leftfirewall=yes
    leftsendcert=always
    leftcert=/etc/openswan/ipsec.d/clcert.pem
    leftid="/C=US/ST=Massachusetts/L=Cambridge/O=XXX/OU=Networks/CN=Leos Literak/Email=leos.literak@XXX.com"
    auto=start

Diky