Problem with Routing through GRE Tunnel over ASA5510
I've a strange problem with the routing from internal network through a GRE Tunnel over an ASA5510:
The infrastructure design is as following:
Internal Network 192.168.1.x
ASA5510 as Internet Gateway with 192.168.1.1
Cisco 2600 Router for GRE L2L VPN Tunnel with 192.168.1.3 IP
SSL VPN LAN through ASA5510 with 10.1.1.x Subnet
L2L VPN Subnet through GRE L2L VPN Tunnel with 10.1.2.x Subnet
The tunnel is up and working, i can access the 10.1.2.x L2L VPN Subnet (inside) without any issue from SSL VPN 10.1.1.x Subnet (outside).
From the internal network 192.168.1.x (inside) i can only access the 10.1.2.x L2L VPN Subnet (inside) when i add on the local client a static routing "10.1.2.x MASK 255.255.255.0 192.168.1.3" - so if the packages go directly to L2L VPN Router it works, as soon there is just the ASA5510 as the default gateway in place it doesn't work.
I've added already a NAT Rule for 10.1.2.x (inside) to 192.168.1.x (inside) and back and in addition a static routing entry for 10.1.2.x Subnet through 192.168.1.3 gateway but it's still not working.
From the other side of the tunnel it's the same issue, as long there is no static routing entry on the server at 192.168.1.x subnet, you cannot access services there (e.g. AD, DNS, WWW, ...), as soon the entry is in place, it works.
It looks for me, that the ASA doesn't handle the traffic correct from 192.168.1.x Subnet to 10.1.2.x Subnet - maybe because both are "inside"?
On 18th December 2020, Cisco announced the latest IOS XE release - Cisco IOS XE Bengaluru 17.4.1a
The first one in the Cisco IOS XE Bengaluru release series, IOS XE 17.4.1a unlocks various routing features and enhancements comprehensively c...
This event had place on Tuesday 19th, January 2021 at 10hrs PDT
In this session attendees received an introduction to Software Defined-WAN (SD-WAN) and the importance of control connections, and learn how to configure devices us...
(view in My Videos)
Community Live- May the SD-WAN Force Be With You
This event took place on Tuesday 19th, January 2021 at 10:00hrs PDT
In this session attendees received an introduction to Software Defined-WAN (SD-WAN) and the importance of ...
Cisco Champion Radio · S8|E3 The Cisco DNA Center Machine Reasoning Engine
Machine Reasoning is a new category of AI/ML that you will soon hear a lot about. It saves your IT team time by automating complex and tedious networking tasks. It can also...
To participate in this event, please use the button to ask your questions
In this session attendees will receive an introduction to Software Defined-WAN (SD-WAN) and the importance of control connections, and learn how to configure devices usi...