How to set up traffic routing between three points through the central one?

Question

Cisco

There are 3 points, 2 of them have routes with the 3rd one, they are not connected with each other.
1 . cisco 192.168.77.0/24
S 10.215.25.0/24 is directly connected, Dialer0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.1.0/24 is directly connected, Tunnel0
L 172.16.1.1/32 is directly connected, Tunnel0
172.17.0.0/32 is subnetted, 2 subnets
C 172.17.116.11 is directly connected, Dialer0
C 172.17.116.12 is directly connected, Dialer0
S 192.168.44.0/24 [1/0] via 172.17.116.11, Dialer0
192.168. 77.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.77.0/24 is directly connected, GigabitEthernet0/1.1
L 192.168.77.2/32 is directly connected, GigabitEthernet0/1.1
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/1.1 192.168.77.2 YES NVRAM up up
Dialer0 172.17.116.12 YES IPCP up up
Tunnel0 172.16.1.1 YES NVRAM up up
2 . cisco 192.168.97.0/24 S
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 1/0] via 172.16.1.1, Tunnel1
S 192.168.77.0/24 [1/0] via 172.16.1.1
C 192.168.97.0/24 is directly connected, GigabitEthernet0/1.1
L 192.168.97.2/32 is directly connected, GigabitEthernet0/1.1
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/1.1 192.168.97.2 YES NVRAM up up
Tunnel1 172.16.1.3 YES NVRAM up up
3 . mikrotik 192.168.44.0/24
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
ADS 192.168.77.0/24 172.17.116.12 1
AS 192.168.97.0/24 172.17.116.12 1
[3 ]mikrotik(pptp_server) <-> (pptp_client)[ 1 ]cisco(gre) <-> (gre)[ 2 ]cisco
Through the central point through tunnels 2 and 3 are available, how to configure traffic routing between extreme points 2 and 3, through the central, static routes to the desired networks are registered through the created tunnels, but the resources are still not available.

Answer 1

у нас сеть из Микротиков и эта задача решается с помощью OSPF довольно элементарно - каждая точка анонсирует свою подсеть в рамках одного и того же пространства (Area) и маршруты пушатся всем участникам.
Настройка на микротиках элементарна:
1. добавляем в OSPF Gre интерфейсы, предварительно повесив с обоих сторон на каждый gre по статическому адресу
2. добавляем в список анонсируемых подсетей свою внутреннюю сеть и подсеть в которой сидят GRE
всё! дерево маршрутов само строится и уходит на удаленные точки
причем если добавляем узлы еще глубже, т.е. если в вашем случае добавим точку (4) подключенную через (2), то другая крайняя точка (3) - сразу же узнает и сможет обмениваться с ней информацией

Answer 2

You don’t need to lift anything on Mikrotik (if you don’t want to). To solve routing problems, just look at ip route and trace(source) to get started. In most cases, this is enough to solve the problem.
From that konfa which was sent, I do not see at you any ospf. Remove static where it is clearly not needed and configure OSPF correctly.
Based on your scheme, the solution is as follows:
1. On Mikrotik, make a default route towards the tunnel
2. On Cisco 1, raise OSPF. With the network command, add the networks of both tunnel interfaces (ptpt and GRE). As well as those networks that you need to announce and from the L3 interfaces of which the networks will be announced. You also make a static route for Mikrotik networks towards the tunnel (pptp) and redistribute the static route to the OSPF process.
3. On Cisco 2, do the same as on 1, except for static route and redistribution