unable to reach peer end public IP via vpn tunnel

[MohammedAsik]

HI Team

I have created S2S VPN tunnel between palo alto and cyberoam firewall.

Tunnel is up but the traffic is not flow.

Under Cyberoam firewall there is one server with public IP 144.21.X.X.

From palo alto we need to reach the peer end public IP 144.21.X.X via the vpn tunnel.

but whenever I tried to reach the peer end  public IP 144.21.X.X its going via the internet rule instead of vpn rule.

Our requirement is that traffic should go via the vpn tunnel to reach the IP 144.21.X.X

I have configured the PBF policy but its not work.. Please help on this 

Regards

Mohammed Asik

[SutareMayur]

Hey,

This is expected.

Your PEER IP communication will happen over internet only. The proxy IDs configured will only pass through tunnel.

- Mayur

[MohammedAsik]

HI Mayur

I have configured proxy ID s also. but its not working

regards
Mohammed Asik

[SutareMayur]

Hi @MohammedAsik Check if routes are pointed towards proper tunnel interface. 

Verify traffic logs once if matching correct security policy and sending traffic to correct tunnel interface.

-Mayur

[MohammedAsik]

Please find the below routing and security policy details

144.250.3.222/32   0.0.0.0   10   A S   tunnel.10

{
from inside;
source 172.31.62.0/24;
source-region none;
to vpn;
destination 144.250.3.222;
destination-region none;
user any;
category any;
application/service 0:any/any/any/any;
action allow;
icmp-unreachable: no
terminal yes;
}

Regards

Mohammed Asik

[SutareMayur]

Hi @MohammedAsik What is 0.0.0.0 in the route? is it next hop?

What you found in traffic logs?? Is firewall passing it to same tunnel interface?

-Mayur

[MohammedAsik]

Mayur

its a tunnel interface. thats why its showing next hop as 0.0.0.0.

In traffic logs its taking the internet rule and its not pass through tunnel interface. its passing through internet interface Ethernet 1/1.

Mohammed Asik

[SutareMayur]

Can you please check once if tunnel interface belongs to VPN zone?

Mayur

[MohammedAsik]

Please find the below ss  tunnel.10 interface 

[SutareMayur]

Something is mis configured .  Check any pbf which is sending traffic on external interface or traffic getting NAT?

please share traffic log snap?

Mayur

[svelez]

Hi Mohammed,

Have you checked your NAT rules? 

Since 144.21.X.X is a public IP, you might be hitting a NAT rule for the Internet depending on which zone your tunnel interface is located.

Also, I see that your Tunnel interface is part of the VPN zone. Is the source traffic is coming from the Inside zone? If so, do you have a security rule on your FW allowing communication between the Inside and VPN zone?

[MohammedAsik]

Hi Svelez

Yes I have security rule to allow from inside to vpn zone. Please find the below security rule and static route for respective tunnel traffic

144.250.3.222/32   0.0.0.0   10   A S   tunnel.10

{
from inside;
source 172.31.62.0/24;
source-region none;
to vpn;
destination 144.250.3.222;
destination-region none;
user any;
category any;
application/service 0:any/any/any/any;
action allow;
icmp-unreachable: no
terminal yes;
}

[SutareMayur]

@MohammedAsik  hey, are you still facing issues?

- Mayur

[MohammedAsik]

Hi Mayur

Yes, still I am facing this issue

[SutareMayur]

@MohammedAsik,

We can check it once over zoom or webex if you want.

- Mayur