Thing 1:

eth0

IP: 172.24.2.1

wlan0: (HOSTAPD)

IP: 172.24.1.1

sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1

route -n

 Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.24.2.2      0.0.0.0         UG    0      0        0 eth0
172.24.1.0      0.0.0.0         255.255.255.0   U     0      0        0 wlan0
172.24.2.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0

/etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1

iptables-save

# Generated by iptables-save v1.6.0 on Mon Sep 25 11:06:45 2017
*nat
:PREROUTING ACCEPT [143:74243]
:INPUT ACCEPT [15:1386]
:OUTPUT ACCEPT [40:2905]
:POSTROUTING ACCEPT [10:927]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Mon Sep 25 11:06:45 2017
# Generated by iptables-save v1.6.0 on Mon Sep 25 11:06:45 2017
*mangle
:PREROUTING ACCEPT [474:101797]
:INPUT ACCEPT [279:24338]
:FORWARD ACCEPT [8:536]
:OUTPUT ACCEPT [223:24658]
:POSTROUTING ACCEPT [226:24674]
COMMIT
# Completed on Mon Sep 25 11:06:45 2017
# Generated by iptables-save v1.6.0 on Mon Sep 25 11:06:45 2017
*filter
:INPUT ACCEPT [279:24338]
:FORWARD ACCEPT [5:380]
:OUTPUT ACCEPT [222:24698]
-A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i wlan0 -o eth0 -j ACCEPT
COMMIT


        ===============================================================================

Thing 2:

eth0

IP: 172.24.2.2

wlan0: (connected to local internet wifi)

IP: 192.168.1.196

sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1

route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.24.2.1      0.0.0.0         UG    0      0        0 eth0
172.24.2.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   UG    0      0        0 wlan0

/etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
#nameserver 8.8.8.8
nameserver 192.168.1.1