[strongSwan] Traffic in a Hub and Spoke setup not forwarded
Martin Sand
dborn at gmx.net
Fri Feb 24 23:59:15 CET 2017
Sure, please find enclosed the requested files.
Best regards/Viele Grüsse
Martin
On 02/24/2017 11:52 PM, Noel Kuntze wrote:
> Of course not. This is not a problem with the routing table.
> Please make sure you understand exactly what's going on before
> attempting to solve problems. Other technology might not
> be as forgiving as this.
>
> The problem is probably that your security policies don't allow
> the forwarding of the traffic or you have SNAT/MASQUERADE (or other)
> iptables rules that either change addresses so the traffic doesn't
> match the policies anymore or outright drop it.
>
> Please provide a paste of the output of `ipsec statusall`
> and `iptables-save`.
>
>
>
> On 24.02.2017 23:49, Martin Sand wrote:
>> Hi all
>>
>> After some time I began to investigate again.
>> I think the problem is that my strongSwan router is behind a modem (another router) which I cannot set to bridge modus.
>> The modem is NATing the traffic.
>>
>> Routing table 220 shows the problem.
>> The traffic is sent to the modem (192.168.0.1), connected to the internet and my strongSwan vpn router (192.168.2.1).
>> The modem is also the default gateway.
>>
>> root at OpenWrt:~# ip route show table 220
>> 192.168.1.0/24 via 192.168.0.1 dev eth0 proto static src 192.168.2.1
>> 192.168.3.0/24 via 192.168.0.1 dev eth0 proto static src 192.168.2.1
>>
>> I tried to get around the problem by setting the via route to the external IP of my modem (134.100.110.120).
>> But this does not work:
>>
>> root at OpenWrt:~# ip r c table 220 192.168.1.0/24 via 134.100.110.120 dev eth0 proto static src 192.168.2.1
>> RTNETLINK answers: Network is unreachable
>>
>> Any ideas on how to solve the issue?
>>
>> Best regards
>> Martin
>>
>> On 11/08/2016 08:46 PM, Martin Sand wrote:
>>> Hi all
>>>
>>> I have a Hub and Spoke setup:
>>> * Central server 192.168.0.1
>>> * Router 1: 192.168.1.1
>>> * Router 2: 192.168.2.1
>>>
>>> I cannot reach the computers on the other side of the network although tunnel is established.
>>> Do I miss an iptable or route information?
>>>
>>> Output from 192.168.1.100 when trying to reach a computer on the other network (192.168.2.100):
>>> [user at workstation ~]$ tracepath 192.168.2.100
>>> 1?: [LOCALHOST] pmtu 1500
>>> 1: router-1 0.475ms
>>> 1: router-1 0.445ms
>>> 2: no reply
>>>
>>> Output of route on Router 1 (192.168.1.1):
>>> 192.168.2.0/24 via 80.10.10.1 dev eth0 proto static src 192.168.1.1
>>>
>>> Output of route on Router 2 (192.168.2.1):
>>> 192.168.1.0/24 via 192.168.0.1 dev eth0 proto static src 192.168.2.1
>>>
>>> Any ideas on what is going wrong? Maybe because one router shows the external IP of the Hub instead of the internal one?
>>>
>>> Best regards
>>> Martin
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.strongswan.org
>>> https://lists.strongswan.org/mailman/listinfo/users
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.strongswan.org
>> https://lists.strongswan.org/mailman/listinfo/users
>>
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Status of IKE charon daemon (strongSwan 5.3.3, Linux 3.18.20, mips):
uptime: 24 minutes, since Feb 24 23:30:27 2017
malloc: sbrk 151552, mmap 0, used 139840, free 11712
worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, scheduled: 5
loaded plugins: charon aes des rc2 sha1 sha2 md5 random nonce x509 revocation constraints pubkey pkcs1 pgp dnskey sshkey pem fips-prf gmp xcbc hmac attr kernel-netlink resolve socket-default stroke updown xauth-generic
Listening IP addresses:
192.168.0.31
192.168.2.1
Connections:
vpn-mann: %any...vpn.example.de IKEv2, dpddelay=30s
vpn-mann: local: [C=DE, O=StrongSwan, CN=mann] uses public key authentication
vpn-mann: cert: "C=DE, O=StrongSwan, CN=mann"
vpn-mann: remote: [vpn.example.de] uses public key authentication
vpn-mann: cert: "C=DE, O=StrongSwan, CN=vpn.example.de"
vpn-mann: child: 192.168.2.0/24 === 192.168.1.0/24 192.168.3.0/24 PASS, dpdaction=restart
Security Associations (1 up, 0 connecting):
vpn-mann[1]: ESTABLISHED 23 minutes ago, 192.168.0.31[C=DE, O=StrongSwan, CN=mann]...200.200.8.224[vpn.example.de]
vpn-mann[1]: IKEv2 SPIs: a2b57fe98a312245_i* 484d1d053cc36aaa_r, public key reauthentication in 28 minutes
vpn-mann[1]: IKE proposal: AES_CBC_128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
vpn-mann{4}: INSTALLED, TUNNEL, reqid 1, ESP in UDP SPIs: c5f28034_i c535472d_o
vpn-mann{4}: AES_CBC_128/HMAC_SHA1_96, 0 bytes_i, 0 bytes_o, rekeying in 5 minutes
vpn-mann{4}: 192.168.2.0/24 === 192.168.1.0/24 192.168.3.0/24
vpn-mann{5}: INSTALLED, TUNNEL, reqid 1, ESP in UDP SPIs: cca10f29_i cd435e9e_o
vpn-mann{5}: AES_CBC_128/HMAC_SHA1_96, 0 bytes_i, 0 bytes_o, rekeying in 6 minutes
vpn-mann{5}: 192.168.2.0/24 === 192.168.1.0/24 192.168.3.0/24
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# Generated by iptables-save v1.4.21 on Fri Feb 24 23:54:03 2017
*nat
:PREROUTING ACCEPT [94139:25693304]
:INPUT ACCEPT [23929:1678867]
:OUTPUT ACCEPT [24490:1838326]
:POSTROUTING ACCEPT [529:103136]
:delegate_postrouting - [0:0]
:delegate_prerouting - [0:0]
:postrouting_lan_rule - [0:0]
:postrouting_rule - [0:0]
:postrouting_wan_rule - [0:0]
:prerouting_lan_rule - [0:0]
:prerouting_rule - [0:0]
:prerouting_wan_rule - [0:0]
:zone_lan_postrouting - [0:0]
:zone_lan_prerouting - [0:0]
:zone_wan_postrouting - [0:0]
:zone_wan_prerouting - [0:0]
-A PREROUTING -j delegate_prerouting
-A POSTROUTING -j delegate_postrouting
-A delegate_postrouting -m comment --comment "user chain for postrouting" -j postrouting_rule
-A delegate_postrouting -o br-lan -j zone_lan_postrouting
-A delegate_postrouting -o eth0 -j zone_wan_postrouting
-A delegate_prerouting -m comment --comment "user chain for prerouting" -j prerouting_rule
-A delegate_prerouting -i br-lan -j zone_lan_prerouting
-A delegate_prerouting -i eth0 -j zone_wan_prerouting
-A zone_lan_postrouting -m comment --comment "user chain for postrouting" -j postrouting_lan_rule
-A zone_lan_prerouting -m comment --comment "user chain for prerouting" -j prerouting_lan_rule
-A zone_wan_postrouting -m comment --comment "user chain for postrouting" -j postrouting_wan_rule
-A zone_wan_postrouting -j MASQUERADE
-A zone_wan_prerouting -m comment --comment "user chain for prerouting" -j prerouting_wan_rule
COMMIT
# Completed on Fri Feb 24 23:54:03 2017
# Generated by iptables-save v1.4.21 on Fri Feb 24 23:54:03 2017
*raw
:PREROUTING ACCEPT [30562873:27538250738]
:OUTPUT ACCEPT [92351:9943384]
:delegate_notrack - [0:0]
-A PREROUTING -j delegate_notrack
COMMIT
# Completed on Fri Feb 24 23:54:03 2017
# Generated by iptables-save v1.4.21 on Fri Feb 24 23:54:03 2017
*mangle
:PREROUTING ACCEPT [30562873:27538250738]
:INPUT ACCEPT [86788:8751557]
:FORWARD ACCEPT [30431248:27507406630]
:OUTPUT ACCEPT [92351:9943384]
:POSTROUTING ACCEPT [30523601:27517350687]
:fwmark - [0:0]
:mssfix - [0:0]
-A PREROUTING -j fwmark
-A FORWARD -j mssfix
-A mssfix -o eth0 -p tcp -m tcp --tcp-flags SYN,RST SYN -m comment --comment "wan (mtu_fix)" -j TCPMSS --clamp-mss-to-pmtu
COMMIT
# Completed on Fri Feb 24 23:54:03 2017
# Generated by iptables-save v1.4.21 on Fri Feb 24 23:54:03 2017
*filter
:INPUT ACCEPT [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:delegate_forward - [0:0]
:delegate_input - [0:0]
:delegate_output - [0:0]
:forwarding_lan_rule - [0:0]
:forwarding_rule - [0:0]
:forwarding_wan_rule - [0:0]
:input_lan_rule - [0:0]
:input_rule - [0:0]
:input_wan_rule - [0:0]
:output_lan_rule - [0:0]
:output_rule - [0:0]
:output_wan_rule - [0:0]
:reject - [0:0]
:syn_flood - [0:0]
:zone_lan_dest_ACCEPT - [0:0]
:zone_lan_forward - [0:0]
:zone_lan_input - [0:0]
:zone_lan_output - [0:0]
:zone_lan_src_ACCEPT - [0:0]
:zone_wan_dest_ACCEPT - [0:0]
:zone_wan_dest_REJECT - [0:0]
:zone_wan_forward - [0:0]
:zone_wan_input - [0:0]
:zone_wan_output - [0:0]
:zone_wan_src_REJECT - [0:0]
-A INPUT -j delegate_input
-A FORWARD -s 192.168.3.0/24 -d 192.168.2.0/24 -i eth0 -m policy --dir in --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.2.0/24 -d 192.168.3.0/24 -o eth0 -m policy --dir out --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.1.0/24 -d 192.168.2.0/24 -i eth0 -m policy --dir in --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.2.0/24 -d 192.168.1.0/24 -o eth0 -m policy --dir out --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.3.0/24 -d 192.168.2.0/24 -i eth0 -m policy --dir in --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.2.0/24 -d 192.168.3.0/24 -o eth0 -m policy --dir out --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.1.0/24 -d 192.168.2.0/24 -i eth0 -m policy --dir in --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s 192.168.2.0/24 -d 192.168.1.0/24 -o eth0 -m policy --dir out --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -j delegate_forward
-A OUTPUT -j delegate_output
-A delegate_forward -m comment --comment "user chain for forwarding" -j forwarding_rule
-A delegate_forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A delegate_forward -i br-lan -j zone_lan_forward
-A delegate_forward -i eth0 -j zone_wan_forward
-A delegate_forward -j reject
-A delegate_input -i lo -j ACCEPT
-A delegate_input -m comment --comment "user chain for input" -j input_rule
-A delegate_input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A delegate_input -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j syn_flood
-A delegate_input -i br-lan -j zone_lan_input
-A delegate_input -i eth0 -j zone_wan_input
-A delegate_output -o lo -j ACCEPT
-A delegate_output -m comment --comment "user chain for output" -j output_rule
-A delegate_output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A delegate_output -o br-lan -j zone_lan_output
-A delegate_output -o eth0 -j zone_wan_output
-A reject -p tcp -j REJECT --reject-with tcp-reset
-A reject -j REJECT --reject-with icmp-port-unreachable
-A syn_flood -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 25/sec --limit-burst 50 -j RETURN
-A syn_flood -j DROP
-A zone_lan_dest_ACCEPT -o br-lan -j ACCEPT
-A zone_lan_forward -m comment --comment "user chain for forwarding" -j forwarding_lan_rule
-A zone_lan_forward -m comment --comment "forwarding lan -> wan" -j zone_wan_dest_ACCEPT
-A zone_lan_forward -m conntrack --ctstate DNAT -m comment --comment "Accept port forwards" -j ACCEPT
-A zone_lan_forward -j zone_lan_dest_ACCEPT
-A zone_lan_input -m comment --comment "user chain for input" -j input_lan_rule
-A zone_lan_input -m conntrack --ctstate DNAT -m comment --comment "Accept port redirections" -j ACCEPT
-A zone_lan_input -j zone_lan_src_ACCEPT
-A zone_lan_output -m comment --comment "user chain for output" -j output_lan_rule
-A zone_lan_output -j zone_lan_dest_ACCEPT
-A zone_lan_src_ACCEPT -i br-lan -j ACCEPT
-A zone_wan_dest_ACCEPT -o eth0 -j ACCEPT
-A zone_wan_dest_REJECT -o eth0 -j reject
-A zone_wan_forward -m comment --comment "user chain for forwarding" -j forwarding_wan_rule
-A zone_wan_forward -m conntrack --ctstate DNAT -m comment --comment "Accept port forwards" -j ACCEPT
-A zone_wan_forward -j zone_wan_dest_REJECT
-A zone_wan_input -m comment --comment "user chain for input" -j input_wan_rule
-A zone_wan_input -p udp -m udp --dport 68 -m comment --comment Allow-DHCP-Renew -j ACCEPT
-A zone_wan_input -p icmp -m icmp --icmp-type 8 -m comment --comment Allow-Ping -j ACCEPT
-A zone_wan_input -m conntrack --ctstate DNAT -m comment --comment "Accept port redirections" -j ACCEPT
-A zone_wan_input -j zone_wan_src_REJECT
-A zone_wan_output -m comment --comment "user chain for output" -j output_wan_rule
-A zone_wan_output -j zone_wan_dest_ACCEPT
-A zone_wan_src_REJECT -i eth0 -j reject
COMMIT
# Completed on Fri Feb 24 23:54:03 2017
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