VPN ok, but no traffic on it…

[psylo]

Hello,

What do you call remote interface?

Can you make a quick draw explaining where you see icmp packet and where you don't?

[sap68]

@psylo:

Hello,

What do you call remote interface?

Can you make a quick draw explaining where you see icmp packet and where you don't?

It's a simple point-to-point VPN

Office1 LAN: 192.168.50.0/24 -> pfsense (192.168.50.1/publIP)
Office2 LAN: 172.16.120.0/24 -> netasq (172.16.120.1/publIP)

The configuration of tunnel I'm sure it's ok, because the tunnel goes ON (see image attached):

Anyway, I was wrong about ping: when from my LAN (192.168.50.0) try to ping remote private ip of netasq (172.16.120.1), the packet is recognised by netasq, in fact if I dump the IPSec interface this is the resul of my ping:

U120XA0A0804150>tcpdump -ni enc0
tcpdump: WARNING: enc0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enc0, link-type ENC (OpenBSD encapsulated IP), capture size 96 bytes
09:49:12.598323 (authentic,confidential): SPI 0x08641654: IP 192.168.50.198 > 172.16.120.1: ICMP echo request, id 17957, seq 0, length 64
09:49:13.599303 (authentic,confidential): SPI 0x08641654: IP 192.168.50.198 > 172.16.120.1: ICMP echo request, id 17957, seq 1, length 64
09:49:14.599476 (authentic,confidential): SPI 0x08641654: IP 192.168.50.198 > 172.16.120.1: ICMP echo request, id 17957, seq 2, length 64
09:49:15.598345 (authentic,confidential): SPI 0x08641654: IP 192.168.50.198 > 172.16.120.1: ICMP echo request, id 17957, seq 3, length 64

On Netasq I open a firewall rule that pass all on IPSec interface, but I have another 3 VPN on that netasq that work perfectly and I replicate the rules for this one…


[psylo]

First, can you ping anything else than Netasq interface. When doing that, can you dump on interface in of the Netasq?

[sap68]

@psylo:

First, can you ping anything else than Netasq interface. When doing that, can you dump on interface in of the Netasq?

I try to ping another Lan host (172.16.120.71) and dump IN interface of netasq (172.16.120.1):

tcpdump -ni eth0 host (Pfsense PublicIP) and icmp

But i see no packet.

[psylo]

If you dump on interface in, you'll normally see "deencapsulated" traffic and thus the source IP is the LAN IP (192.168.50.198).

[sap68]

@psylo:

If you dump on interface in, you'll normally see "deencapsulated" traffic and thus the source IP is the LAN IP (192.168.50.198).

You're right, but i have no luck :-/

U120XA0A0804150>tcpdump -ni eth0 host 192.168.50.198 and icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
0 packets captured
2637 packets received by filter
0 packets dropped by kernel

[psylo]

Ok. So, nothing appears on the LAN interface. So, it should be a firewalling problem… Do you have any rule which permits traffic from your LAN to the Netasq LAN?

Last, I suppose there is no route for the range 192.168.50.x on the Netasq. I mean: this range is not known by the Netasq except for your IPSEC tunnel.

[sap68]

@psylo:

Ok. So, nothing appears on the LAN interface. So, it should be a firewalling problem… Do you have any rule which permits traffic from your LAN to the Netasq LAN?

Last, I suppose there is no route for the range 192.168.50.x on the Netasq. I mean: this range is not known by the Netasq except for your IPSEC tunnel.

I have a rule that passAll on IPSec interface from any -> "networks internals" (LAN range)
Do you think it's necessary a static route for 192.168.50.x range?
Thank again for your help!

[psylo]

You don't need to add a route except if the IPsec is configured to "consider IPsec peer as internal". If IPsec is configured like that, you need to add a static route pointing to interface IPsec.

By the way, can you send a screenshot of the firewall rules on the Netasq?

I'll be unavailable for 1 hour.

[sap68]

@psylo:

You don't need to add a route except if the IPsec is configured to "consider IPsec peer as internal". If IPsec is configured like that, you need to add a static route pointing to interface IPsec.

By the way, can you send a screenshot of the firewall rules on the Netasq?

I'll be unavailable for 1 hour.

Ok, thanks!

This are the first 15 rules…

Rule number 12 it's this VPN.
Rule from 5 to 11 it's others (worked!) VPN...


[psylo]

Ok… The point is that you need to be authenticated on the Netasq before your traffic is allowed. This is the @ in the source column...

So, either you change that to get rid of the authentication. Either you authenticate yourself on the Netasq web interface...

Well, as we speak about IPSec tunnel, I strongly recommend to disable the authentication for those traffic (as traffics are already trusted).

[sap68]

@psylo:

Ok… The point is that you need to be authenticated on the Netasq before your traffic is allowed. This is the @ in the source column...

So, either you change that to get rid of the authentication. Either you authenticate yourself on the Netasq web interface...

Well, as we speak about IPSec tunnel, I strongly recommend to disable the authentication for those traffic (as traffics are already trusted).

Oh YES!
That work!

The problem is in the rule 12, I modify the rule so I permit traffic from 192.168.50.0 to Networks internal and now it worked!!!

MANY THANKS guys!

[psylo]

Great news but as said in my previous post, I strongly recommends 2 things for IPSec filtering:

• disable authentication for IPSec tunnel as those traffic are already trusted. Except if you need authentication for HTTP proxy for example.

• use network object (as you've done for your tunnel) for each tunnel…

[sap68]

@psylo:

Great news but as said in my previous post, I strongly recommends 2 things for IPSec filtering:

• disable authentication for IPSec tunnel as those traffic are already trusted. Except if you need authentication for HTTP proxy for example.

• use network object (as you've done for your tunnel) for each tunnel…

Disable auth.: I must disabled auth. also for IPsec mobile connection?

Thanks…

[psylo]

@sap68:

@psylo:

Great news but as said in my previous post, I strongly recommends 2 things for IPSec filtering:

• disable authentication for IPSec tunnel as those traffic are already trusted. Except if you need authentication for HTTP proxy for example.

• use network object (as you've done for your tunnel) for each tunnel…

Disable auth.: I must disabled auth. also for IPsec mobile connection?

Thanks…

Well… Actually, I don't know why you use Authentication for VPN tunnel (rules 5 to 11)... Normally, It's not necessary... But If you do that, you'll need to configure network objects defining all your remote networks in order to avoir security holes... Do you see what I mean?

[sap68]

@psylo:

@sap68:

@psylo:

Great news but as said in my previous post, I strongly recommends 2 things for IPSec filtering:

• disable authentication for IPSec tunnel as those traffic are already trusted. Except if you need authentication for HTTP proxy for example.

• use network object (as you've done for your tunnel) for each tunnel…

Disable auth.: I must disabled auth. also for IPsec mobile connection?

Thanks…

Well… Actually, I don't know why you use Authentication for VPN tunnel (rules 5 to 11)... Normally, It's not necessary... But If you do that, you'll need to configure network objects defining all your remote networks in order to avoir security holes... Do you see what I mean?

Yes, I understand.

I use this particular configuration (made with netasq support) for consent access from outside for some customer that needed access on particular server inside LAN.
Authentication VPN from <<any>> host it's (i think) only method to obtain the goal.
In particular I have a rule for every mobile access and i pass all traffic only to a host.

In you opinion it is a flaw in security?

Thanks…</any>

[psylo]

Ok… You're in an exception and this is not a security hole.
If you use only "any" as source, it could be a security hole but not with authentication.

BTW, good news your tunnel is working.