Wsrtjtyk

So recently i was experimenting with xampp, my setup was as follows,

My desktop connected to D-Link router via Ethernet LAN.

My phone is connected to D-Link router via WiFi.

D-Link router is connected to internet via WAN ethernet PPPoE.

Phone is able to access xampp instance fine.

I bought a new fiber connection and they provided a ZTE router which has 1 fiber input, two ethernet outputs and WiFi capability.

As per new setup,

My PC is connected to ZTE router via Ethernet

Old D-Link router (another room) is connected to ZTE router via Ethernet.[ZTE output -> Dlink WAN (dhcp mode)]

Phone will be connected to ZTE or D-Link depending on where am i.

Issue begins here
Xampp server running on pc.

If my phone is connected to D-Link and i enter local ip of my pc (192.168.1.x) i can access the page.

But,

If my phone is connected to ZTE i cannot access the page.

After researching a lot, i found some articles about enabling NAT, which is already enabled in router.

Screenshot of NAT enabled

Screenshot of disabled firewall

Screenshot of security service control (idk whats this)

Some online resources that i have found,

ZTE H220N port forwarding / firewall issue

Port forwarding tutorial

At last, i tried telnet to ZTE and looked up iptables

/ # iptables --list

Chain INPUT (policy ACCEPT)

target     prot opt source               destination         

ACCEPT     icmp --  anywhere             anywhere             icmp !echo-request

ACCEPT     all  --  anywhere             anywhere             destination IP range 224.0.0.0-239.255.255.255

6rd        all  --  anywhere             anywhere            

srvcntrl   all  --  anywhere             anywhere            

srvdrop    all  --  anywhere             anywhere            

fwports    all  --  anywhere             anywhere            

fwinput    all  --  anywhere             anywhere            

fwdrop     all  --  anywhere             anywhere            



Chain FORWARD (policy ACCEPT)

target     prot opt source               destination         

ACCEPT     icmp --  anywhere             anywhere             icmp !echo-request

ACCEPT     all  --  anywhere             anywhere             destination IP range 224.0.0.0-239.255.255.255

drop_no_nat  all  --  anywhere             anywhere            

urldoor    all  --  anywhere             anywhere            

macfilter  all  --  anywhere             anywhere            

upnp       all  --  anywhere             anywhere            

algfilter  all  --  anywhere             anywhere            

ipfilter   all  --  anywhere             anywhere            

portmapp   all  --  anywhere             anywhere            

dmzmapp    all  --  anywhere             anywhere            

fwforward  all  --  anywhere             anywhere            



Chain OUTPUT (policy ACCEPT)

target     prot opt source               destination         



Chain 6rd (1 references)

target     prot opt source               destination         



Chain algfilter (1 references)

target     prot opt source               destination         



Chain dmzmapp (1 references)

target     prot opt source               destination         



Chain drop_no_nat (1 references)

target     prot opt source               destination         

DROP       all  --  anywhere             anywhere             state INVALID



Chain fwdrop (1 references)

target     prot opt source               destination         



Chain fwforward (1 references)

target     prot opt source               destination         



Chain fwinput (1 references)

target     prot opt source               destination         



Chain fwports (1 references)

target     prot opt source               destination         



Chain ipfilter (1 references)

target     prot opt source               destination         



Chain macfilter (1 references)

target     prot opt source               destination         



Chain portmapp (1 references)

target     prot opt source               destination         



Chain srvcntrl (1 references)

target     prot opt source               destination         



Chain srvdrop (1 references)

target     prot opt source               destination         

DROP       tcp  --  anywhere             anywhere             tcp dpt:http DEVWL match:WANDEV



DROP       tcp  --  anywhere             anywhere             tcp dpt:ftp DEVWL match:WANDEV



DROP       tcp  --  anywhere             anywhere             tcp dpt:telnet DEVWL match:WANDEV



DROP       tcp  --  anywhere             anywhere             tcp dpt:https DEVWL match:WANDEV





Chain upnp (1 references)

target     prot opt source               destination         



Chain urldoor (1 references)

target     prot opt source               destination         



Chain webfilter (0 references)

target     prot opt source               destination         



Chain webpolicy (0 references)

target     prot opt source               destination         



Chain wfmode (0 references)

target     prot opt source               destination         

I am not a network engineer but i am pretty familiar with telnet and other linuxy stuff so i can provide more resources if you ask.

As of now, i cannot do following things,

1. Access ftp server on pc from my phone


2. Access http server on pc from phone


3. Cannot use kdeconnect(pc cant see my phone!)


4. Cast youtube from my pc to chromecast (pc cant see chromecast!)


5. Cannot ping from my phone to pc or vice versa

More details,

1. I can discover phone from another phone in same network


2. I can discover and share files from laptop to phone and vice versa in same wifi network


3. I can discover and share files between ethernet connections, i can ping devices connected to DLink router from pc and vice versa

Model number of ZTE GPON: ZTE F612W