Routing in linux. OrenVPN?

Question

openvpn

There is a remote server with ip xxx.xxx.xxx.xxx running the OpenVPN server. There is a computer with subnet 192.168.31.0/24. I have a router with an OpenVPN client. Subnet 192.168.1.0/24
When a connection is established, all computers and routers have access to their addresses issued by the OpenVPN server (subnet 10.8.0.0/24).
You need to access devices not by vpn addresses, but by their local addresses (for example, 192.168.1.1). You also need to access devices from the 192.168.1.0/24 subnet behind the router.
Itself did not master to deal with iptables. But for example, the vpnki.ru service does this without problems, and without configuring routing on clients.
Server config:

port 1194
proto udp
dev tun
sndbuf 0
rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
tls-auth ta.key 0
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp .txt
client-config-dir /etc/openvpn/ccd
client-to-client
route 192.168.1.0 255.255.255.0
route 192.168.2.0 255.255.255.0
route 192.168.31.0 255.255.255.0
keepalive 10 120
cipher
user nobody
group nogroup
persist-key
persist-tun
status openvpn-status.log
verb 3
crl-verify crl.pem

Client config:

client
dev tun
proto udp
sndbuf 0
rcvbuf 0
remote xxx. xxx. xxx. xxx 1194
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
key-direction 1
verb 3

In the ccd folder in the files with the names of the clients are written:

ifconfig-push 10.8.0.110 255.255.255.0
push "route 10.8.0.0 255.255.255.0"
push "route 192.168.1.0 255.255.255.0"

according to the required networks.
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Answer 1

Here is the answer to my question, now everything works as it should:
Server config:

port 1194
proto udp
dev tun
sndbuf 0
rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
tls-auth ta.key 0
topology subnet
server 10.8.0.0 255.255.255.0
client-config-dir / etc/openvpn/ccd
client-to-client
push "route 192.168.1.0 255.255.255.0"
push "route 192.168.2.0 255.255.255.0"
push "route 192.168.31.0 255.255.255.0"
route 192.168.1.0 252.0
keepalive
cipher AES-256-CBC
user nobody
group nogroup
persist-key
persist-tun
status openvpn-status.log
log-append openvpn.log
verb 3
crl-verify crl.pem
In /etc/openvpn/ccd/router file:
Client configs unchanged.

Answer 2

In the server config, route 192.168.1.0 ... is completely redundant.
and in the route directive, the gateway address for the network is missing.
push "route 192.168.1.0 ... one for all
re-read the HOWTO and man