Hi all,
I would like to set up an IPsec connection with GRE tunnel to route all
traffic from a Lancom router to a Linux server.
I successfully installed VPN and GRE between two Lancoms - this works fine.
Now I replaced one Lancom with a Linux server and installed strongswan
5.5.1.
I got successfully established IPsec connection, but routing traffic is
not working!?
Lancom:
WAN:192.168.203.156/24
LAN: 10.0.0.211/24
Linux-Server:
WAN: 192.168.0.79/24
LAN: 10.0.0.1/24
I know that maybe IP-ranges seems to be strange on LAN interfaces, but
what I am planning to solve is to serve clients behind Lancom with DHCP
leases from Linux servers.
DHCP server is already running on LAN interface from Linux server.
But in the first step I would be glad, to get a Ping successfully routed
through tunnel...
You can find my configuration and output from status commands below.
If I missed something to write, please let me know!
Any help would be greatly appreciated. Thx in advance.
BR
Manu
#########################################################
iptables:
# Generated by iptables-save v1.4.21 on Mon Feb 27 09:49:14 2017
*raw
:PREROUTING ACCEPT [27390:33401494]
:OUTPUT ACCEPT [14840:1301522]
COMMIT
# Completed on Mon Feb 27 09:49:14 2017
# Generated by iptables-save v1.4.21 on Mon Feb 27 09:49:14 2017
*nat
:PREROUTING ACCEPT [1320:185699]
:INPUT ACCEPT [163:41196]
:OUTPUT ACCEPT [607:40276]
:POSTROUTING ACCEPT [11:780]
COMMIT
# Completed on Mon Feb 27 09:49:14 2017
# Generated by iptables-save v1.4.21 on Mon Feb 27 09:49:14 2017
*mangle
:PREROUTING ACCEPT [27389:33401416]
:INPUT ACCEPT [26518:33293236]
:FORWARD ACCEPT [107:8132]
:OUTPUT ACCEPT [14840:1301522]
:POSTROUTING ACCEPT [14947:1309654]
COMMIT
# Completed on Mon Feb 27 09:49:14 2017
# Generated by iptables-save v1.4.21 on Mon Feb 27 09:49:14 2017
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
-A INPUT -m policy --dir in --pol ipsec --proto ipv6-crypt -j ACCEPT
-A INPUT -p 47 -j ACCEPT
-A INPUT -p ipv6-auth -j ACCEPT
-A INPUT -p ipv6-crypt -j ACCEPT
-A INPUT -p ipv6-crypt -j ACCEPT
-A INPUT -p udp -m udp --dport 4500 -j ACCEPT
-A INPUT -p udp -m udp --dport 500 -j ACCEPT
-A INPUT -p udp -m udp --dport 87 -j ACCEPT
-A INPUT -j ACCEPT
-A FORWARD -s 193.1.1.1/32 -d 193.1.1.2/32 -i eth0 -m policy --dir in
--pol ipsec --reqid 1 --proto ipv6-crypt -j ACCEPT
-A FORWARD -s 193.1.1.2/32 -d 193.1.1.1/32 -o eth0 -m policy --dir out
--pol ipsec --reqid 1 --proto ipv6-crypt -j ACCEPT
-A FORWARD -p 47 -m policy --dir out --pol ipsec -j ACCEPT
-A FORWARD -p 47 -m policy --dir in --pol ipsec -j ACCEPT
-A FORWARD -m policy --dir out --pol ipsec --proto ipv6-crypt -j ACCEPT
-A FORWARD -m policy --dir in --pol ipsec --proto ipv6-crypt -j ACCEPT
-A FORWARD -j ACCEPT
-A OUTPUT -p ipv6-auth -j ACCEPT
-A OUTPUT -p ipv6-crypt -j ACCEPT
-A OUTPUT -p ipv6-crypt -j ACCEPT
-A OUTPUT -p udp -m udp --dport 4500 -j ACCEPT
-A OUTPUT -p udp -m udp --dport 500 -j ACCEPT
-A OUTPUT -p udp -m udp --dport 87 -j ACCEPT
-A OUTPUT -m policy --dir out --pol ipsec --proto ipv6-crypt -j ACCEPT
-A OUTPUT -p 47 -j ACCEPT
-A OUTPUT -j ACCEPT
COMMIT
# Completed on Mon Feb 27 09:49:14 2017
###################################################
Routing:
0.0.0.0 192.168.0.11 0.0.0.0 UG 0 0 0 eth0
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 ipsec0
192.168.0.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
193.1.1.1 0.0.0.0 255.255.255.255 UH 0 0 0 ipsec0
###################################################
IPsec status:
Status of IKE charon daemon (strongSwan 5.5.1, Linux 3.16.2, i686):
uptime: 17 minutes, since Feb 27 09:38:50 2017
malloc: sbrk 299008, mmap 0, used 161544, free 137464
worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0,
scheduled: 2
loaded plugins: charon aes des rc2 sha2 sha1 md5 random nonce x509
revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey
pem fips-prf gmp xcbc cmac hmac attr kernel-netlink resolve
socket-default stroke vici updown xauth-generic
Listening IP addresses:
192.168.0.79
192.168.2.1
10.0.0.1
Connections:
net-net: 192.168.0.79...192.168.203.156 IKEv1
net-net: local: [193.1.1.2] uses pre-shared key authentication
net-net: remote: [193.1.1.1] uses pre-shared key authentication
net-net: child: 193.1.1.2/32 === 193.1.1.1/32 TUNNEL
Security Associations (1 up, 0 connecting):
net-net[1]: ESTABLISHED 17 minutes ago,
192.168.0.79[193.1.1.2]...192.168.203.156[193.1.1.1]
net-net[1]: IKEv1 SPIs: 0ed2f0323516cdc9_i* e306944936d04d17_r,
pre-shared key reauthentication in 26 minutes
net-net[1]: IKE proposal:
AES_CBC_128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024
net-net{1}: INSTALLED, TUNNEL, reqid 1, ESP SPIs: c93984d3_i
3d7dfb5e_o
net-net{1}: AES_CBC_128/HMAC_SHA1_96/MODP_1024, 0 bytes_i, 0
bytes_o, rekeying in 32 minutes
net-net{1}: 193.1.1.2/32 === 193.1.1.1/32
#################################################
ipsec.conf:
config setup
conn %default
keyexchange=ikev1
authby=secret
left=192.168.0.79
leftid=193.1.1.2
leftsubnet=193.1.1.2/32
leftfirewall=yes
auto=start
conn net-net
right=192.168.203.156
rightsubnet=193.1.1.1/32
rightid=193.1.1.1
ike=aes-sha1-modp1024
esp=aes-sha1-modp1024
ikelifetime=3600s
keylife=3600s
#################################################
ip tunnel add ipsec0 local 193.1.1.2 remote 193.1.1.1 mode gre
ip link set ipsec0 up
ip route add 10.0.0.0/24 dev ipsec0
ip route add 193.1.1.1/32 dev ipsec0
ip -s tunnel show ipsec0
~ # ip -s tunnel show ipsec0
ipsec0: gre/ip remote 193.1.1.1 local 193.1.1.2 ttl inherit
RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts
0 0 0 0 0 0
TX: Packets Bytes Errors DeadLoop NoRoute NoBufs
0 0 115 0 115 0
-> pointing to NoRoute pakets, but don't recognize what is wrong?!
################################################
################################################
What I have also tried is setting up a bridge instead of commands above
- but also no success with that:
ip link add gretap1 type gretap local 193.1.1.2 remote 193.1.1.1
ip link set dev gretap1 up
brctl addbr br0
brctl addif br0 gretap1
brctl addif br0 eth2
ip addr add 10.0.0.1/24 dev br0
ip link set br0 up
################################################
furthermore tried with that rule:
iptables -t nat -A POSTROUTING -o ipsec0 -j SNAT --to-source 193.1.1.2
and got tcpdump result:
~ # tcpdump -i ipsec0 -vvn
tcpdump: WARNING: ipsec0: no IPv4 address assigned
tcpdump: listening on ipsec0, link-type LINUX_SLL (Linux cooked),
capture size 65535 bytes
10:24:16.964011 IP (tos 0x0, ttl 64, id 49218, offset 0, flags [DF],
proto ICMP (1), length 84)
193.1.1.2 > 10.0.0.211: ICMP echo request, id 55629, seq 13, length 64
10:24:17.972005 IP (tos 0x0, ttl 64, id 49294, offset 0, flags [DF],
proto ICMP (1), length 84)
193.1.1.2 > 10.0.0.211: ICMP echo request, id 55629, seq 14, length 64
###############################################
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