Messages

I'm confident firewall rules are correct as I can ssh to 192.168.1.1 (OpnSense on custom cloud) from an AWS EC2 server. I can also proxy to 192.168.1.100 (web server) via 192.168.1.1 from said server.

To be sure, I disabled firewall on OpnSense and tested with the same outcome - SSH and ping directly to 192.168.1.100 fails from EC2 server.

It feels like routing related and I don't have any static routes defined under System > Routes > Configuration. I'm not quite sure what to select for Network Address (192.168.1.100?) and Gateway (WAN?).

NAT is set to Automatic and I can see the AWS WAN interfaces are listed.

AmazonIKEvpn03139b9b80 networks, AmazonIKEvpn03139b9b81 networks, LAN networks, Loopback networks, 127.0.0.0/8

Thanks. So I've added the null route for 192.168.1.0/24, which is also the advertised route under OpnSense > System > Routes > Configuration.

Network: 192.168.1.0/24
Gateway: Null4 - 127.0.0.1

I am still unable to connect from my EC2 instance (172.31.40.15) to the VM 192.168.1.100 behind OpnSense (192.168.1.1). This is what Wireshark shows:

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25 20.305718 172.31.40.15 192.168.1.100 TCP 66 [TCP Retransmission] 49418 → 80 [SYN, ECN, CWR] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
25 20.305718 172.31.40.15 192.168.1.100 TCP 66 [TCP Retransmission] 49418 → 80 [SYN, ECN, CWR] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
27 20.557705 172.31.40.15 192.168.1.100 TCP 66 [TCP Retransmission] 52171 → 80 [SYN, ECN, CWR] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1

I don't think it's firewall related, as I disabled this to check.

I should also mention that tracert from my EC2 instance (172.31.40.15) yields...

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Tracing route to ip-192-168-1-100.ec2.internal [192.168.1.100] over a maximum of 30 hops:

  1     8 ms     8 ms     8 ms  169.254.126.28
  2     *        *        *     Request timed out.
  3     *        *        *     Request timed out.
...

169.254.126.28 is what AWS refers to as the inside address for the customer gateway for tunnel 1.

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Tunnel Number Outside IP Address Inside IPv4 CIDR Inside IPv6 CIDR Status Status Last Changed Details
Tunnel 1 4.279.84.223 169.254.126.26/30 - UP July 12, 2021 at 1:43:21 PM UTC+1 1 BGP ROUTES
Tunnel 2 100.20.252.220 169.254.222.26/30 - UP July 12, 2021 at 1:43:16 PM UTC+1 1 BGP ROUTES

AWS also shows routing is propagated.

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Destination Target Status Propagated
172.31.0.0/16 local Active No
0.0.0.0/0 igw-67d7675d Active No
192.168.1.0/24 vgw-01b10b25ec5e28844 Active Yes

vgw-01b10b25ec5e28844 is the gateway on the AWS side.

Being a complete newbie, why is the the null route required? Also, what would the null route look like and do I need to specify the AWS gateways as the gateway?

In AWS, routing is propagated and appears under VPC > Route Tables:

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Destination, Target, Status, Propagated
0.0.0.0/0, igw-27d7295d, Active, No
172.31.0.0/16, local, Active, No
192.168.1.0/24, vgw-01c10b23ec5e24488, Active, Yes

Do I need to add a Null route as mentioned under Routing (FRR) > BGP > General tab in OpnSense?

Does anyone know what this means and what I exactly need to do?

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OpnSense > Routing > BGP > General

Network: 192.168.1.0/24
Select the network to advertise, you have to set a Null route via System -> Routes


I don't think I've done this.

Hi,

OpnSense newbie here.

I have configured an IPsec tunnel between a bespoke cloud platform and AWS and the tunnel is up with 1 BGP route advertised.

I can SSH from an EC2 instance in AWS to the VM running OpnSense on the bespoke platform using 192.168.1.1. However, I am unable to SSH from the same EC2 instance to another VM 192.168.1.100 in the same network as OpnSense. SSH reports "ssh: connect to host 192.168.1.100 port 22: Connection timed out".

I can SSH from 192.168.1.1 to 192.168.1.100.

Is this firewall related or routing problem? Any guidance is appreciated.

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Bespoke cloud platform
VM hosting OpnSense - 192.168.1.1 (ASN 64514, BGP advertised 192.168.1.0/24)
VM web server - 192.168.1.100

AWS Site-to-Site VPN (AWS ASN 64512)
VM - 172.31.86.32

OpnSense > Firewall > Rules > IPsec

Protocol: IPv4
Source: *
Port: *
Destination: LAN net
Port: *
Gateway: *

OpnSense > Firewall > Rules > LAN

Default allow LAN to any IPv4 and IPv6.

OpnSense > Firewall > Rules > WAN

Allow 500 (ISAKMP), 4500 (IPsec NAT-T), 179 (BGP).

Routing > Diagnostics > BGP > IPv$ Routing Table

Valid Best Internal Network Next Hop Metric LocPrf Weight Path Origin
Y N N 172.31.0.0/16 169.254.220.77 200 0 0 64512 IGP
Y Y N 172.31.0.0/16 169.254.135.37 100 0 0 64512 IGP
Y Y N 192.168.1.0/24 0.0.0.0 0 0 32768 Internal IGP