Questions tagged [router]

A device that connects two or more networks and is capable of forwarding data packets to a destination based on information contained within a packet and internal routing tables.

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39 views

How can I MASQUERADE between vlan bridges

I have created two VLAN bridges in openwrt based system which has single physical interface. *) eth0->lan->br-lan *) br-lan->br-lan.2(VLAN INTF)->br-vlan2(BRIDGE INTF) *) br-lan->br-lan....
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Is it OK, to use iptables SNAT rule with inverted -o parameter?

Would it be OK/reliable, to use just one rule?: iptables -t nat -I POSTROUTING ! -o eth2 -s 192.168.10.0/24 -j SNAT --to PUBLIC_IP_ADDRESS The BGP linux router has 25 ethernet interfaces. This ...
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20 views

Netflow records with Destination Ports 1025,257 and Protocol as ipv6-icmp

I have some Netflow records from a bunch of routers. The records contain IPv6 flows and there are entries with protocol as ipv6-icmp and their destination port values as 0, 1025 and 257. I know from ...
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2answers
52 views

ipv6 distribute an ula prefix without an router

I have a network which has no ipv6 connectivity to the internet. But I'd like to play a little with private networking. So I want to use ULAs for my devices and automatically distribute the prefix. I ...
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25 views

Router forces browser to use older, presumably cached, webfiles

We are trouble shooting website where we deploy a new version but our Computer browser still pulls the older pages. When we disconnect from the router (WiFi) and connect to a hotspot (mobile phone/...
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Should I do the stateful matching with iptables for nat table?

I often see that there are some stateful matching rules in a iptables' chain such as INPUT. I known what they are doing, and I'm interested in that Should I do the same for the chains of the table ...
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iptables: How to block UDP between devices on LAN-side of gateway (using dd-wrt firmware)

Goal: To block UDP traffic to devices on LAN-side of this gateway (using dd-wrt firmware), that communicate with internet and each other, to test specific communications applications running on each ...
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101 views

How does "DROP all anywhere" in the FORWARD table not render my router useless?

I recently learned about IPTables and IP routing in order to configure a single-board computer to isolate a particular machine from the rest of my network, while still permitting it to access the ...
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Cisco asr 1001-hx

Can't seem to figure out what the wan throughput of a cisco asr 1001-hx is? Also, I'm no cisco expert but, wanted to know if you guys have a go to cheat sheet/website that lists all the throughputs of ...
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Make all net clients of a wifi router on a subnet have IP addresses in the form of clients of the parent router [migrated]

i have an ADSL wifi Zyxel router connecter to outer internet and it serves IP addresses in the form of 10.0.0.x by DHCP - which is correct. Then i have a TP-Link wif router connected to Zyxel as a ...
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36 views

How incoming traffic pass through a port with no port forwarding in home router [migrated]

Analyzing the incoming/outgoing traffic of my telegram bot hosted on a raspberry pi inside my home network, I had got a trivial doubt. 09:38:13.299379 IP 149.154.167.220.443 > 192.168.1.16.43576: ...
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Looking for the best recommendation to join two different LAN networks running on two different routers

First, I'll try to explain the current network layout. I'm not a super-experienced networking professional (yet...) and I have come up with a possible solution, but I wanted to run it by some experts ...
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How to add the normal routing information of a router to BIRD?

Suppose the following network layout: R1: R2: 10.1.1.0/24 <--- 10.1.1.1, 192.168.1.1 <----------> 192.168.1.2, 10.1.2.1 ---> 10.1....
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iptables - how does one use multiple prerouting sources to force dns traffic through a particular IP?

I know this question has been asked historically, but the answers I have yet to find are not all too helpful in this one niche use case. I currently have one router running DD-WRT on 192.168.0.1, one ...
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Routing issue while using 2 router Draytek Vigor 3910 with VLANs

I'm having problem when using 2 Draytek Vigor 3910 at the same time. This diagram was working well with Vigor 3900 but they replaced to new model 3910. My issue: 1, OSPF between 2 router's not ...
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1answer
34 views

Does traceroute use the same path?

I was a little bit confused about the use of traceroute. According to this The traceroute command is used to see how packets are getting routed. It works by sending packets with increasing TTL values,...
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How to port forward on an ATT Router/Modem?

I am trying to open port 2222 for an open-ssh server on my linux machine. I am able to log into it just fine from my local IP address. sudo systemctl status returns: Loaded: loaded (/lib/systemd/...
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Ensuring internet is disabled for devices connected to second router

I think I have two routers: Router A is connected to WAN and the Router A DHCP gives out IPs in range 192.168.0.10 to 192.168.0.128. Router B is connected by ethernet cable to router A and gives out ...
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23 views

RRAS NAT on specific fixed IP address

I have an AWS EC2 VPC-based Windows Server instance that has two private IP addresses and two elastic IP addresses on a single network interface with IP addresses: IP Role 172.16.30.245 Primary 172....
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48 views

port forward only for vpn clients on draytek vpn router

I have a VPN server set up on a vigor 2865. I now want to allow one external ip address, or anyone connected to this vpn, access to a website on an internal server. This website uses a public dns name ...
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48 views

Reached cloud router limits

I have reached the limit of 5 cloud routers per region, if I edit the quotas I can see only a project limit, is it possible to increase the limit of 5 cloud routers per region? if yes, how? Also I ...
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21 views

How do i translate the same configuration from this TPLINK router config to OPNsense

So I'm trying to connect to PPPOE but they had this config to do which i don't know how to translate to OPNsense The initial configuration:(click on the link to see it) https://user-images....
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1answer
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find the ip address on Linksys [closed]

I get two differents Linksys routers : WAG54GX2 and WAP54G. I tried to get the IP address to reset the routers correctly and verify if they are still working. So I use the RJ45 cable on my routers and ...
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Transient hostname was changed in a server

In one of our production server automatically set transient hostname. hostnamectl status shows Static hostname: abc11.example.com Transient hostname: I Icon name: computer-vm ...
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40 views

How can i connect OPNsense router to Mikrotik Switch

I've encountered this situation where I'm to access the switch from my router: Here is what i have set: Lan (DHCP 192.168.50.1 , DHCPIPV6) WAN (DHCP 192.168.80.1,DHCPIPV6) Mikrotik (DHCP 192.168.80.1,...
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Turn Ubuntu Machine with One two Network cards into a Router

I have a Ubuntu 20.04.2 laptop that i intend to turn into a router. I have two network cards one is wireless (wl01) which is connected to Internet. I have an ethernet card (enp3s0) IP ADDRESS 192.168....
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4answers
6k views

What happens if two local systems download the same resource on same port?

I'm aware of NAT table. I just want to know what happens if two clients in a private local area network want to download exactly the same resource on the same port? In other words , When a packet ...
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2answers
19 views

ISP configured Dynamic IP is different from what websites see when I access them

We switched our internet connection and now something wired is going on. I am using a TP Link Archer 1600 modem. The ISP asked me to set connection type as "Dynamic IP" under EWAN settings. ...
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22 views

Debian: no traceroute output for single host

After a recent upgrade to Debian 11 on my router I noticed that my desktop (current W10) only sporadically gets replies when doing a traceroute across the router, usually just * * *, rarely a single ...
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32 views

How to create a compatible cisco router in EC2 case?

This is the picture of my GNS3 project, which includes Cisco Router, Ethernet Switch, and a list of my client VMs. If this project was created on my physical server, these are the settings I will add ...
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1answer
36 views

How to configure two addresses to access other frontends/port [duplicate]

How do I configure two addresses to access other frontends / different ports, for example: Address Mapping to www.mysite.com/config (nodejs) localhost:3000 www.mysite.com/client (django) localhost:...
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1answer
34 views

What is default IPv6 configuration on routers

I've just started learning IPv6. I have a router running OpenWrt and I would like to configure it to use IPv6. As I know this address can be assigning to a client with or without DHCPv6 server. Do you ...
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Linux router used to redirect traffic from the outside to an internal device, but the internal device needs to respond using another port

I am working on a router between an external radio/modem and my device, where the router makes a dial-up connection using the ppp protocol to the radio and sets an iptables rules between the received ...
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28 views

setting up transparent proxy on gateway computer

I am looking to setup a transparent proxy (client) on a computer which will act as a gateway/router for (client) computers connecting to this gateway computer. The client computers use a VPN client ...
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2answers
178 views

Connecting to Multiple cameras which each acts as a WiFi Access Point [closed]

I have 7 cameras each acting as a WiFi Access Points and I can not change their configurations. Camera1 SSID: camera1, pass: 1234, it has static IP: 192.168.42.1 and built-in DHCP server Camera2 SSID: ...
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0answers
164 views

How to make my apache web server public? [closed]

I am a complete beginner at web development. I want to try accessing my web server through another device from another network. Likewise, I have managed to access it from the same Wi-Fi using my ...
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1answer
32 views

Connecting Computers accross different subnets or IP addresses

I have a setup that involves: Cable modem/router at 192.168.10.1 Wireless Router 1 at 192.168.20.1 Wireless Router 2 at 192.168.30.1 The wireless router are connected to the Cable Modem via the WAN ...
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519 views

Huawei HG8245Q2 connected with other router in bridge mode and WiFi with internet access

I have Huawei HG8245Q2 router with GPON WAN and 4 ethernet ports and powerful WiFi module. Behind this router I have second (Mikrotik) router and a L2TP server on it. Unfortunately - Huawei router in &...
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1answer
33 views

No gateway / LAN without internet / CCTV system

I've tried to post this on superuser.com but they don't accept questions from Tor network now for more than a week so I hope I can find help here since we could say it's network administration ...
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2answers
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Why we would need public IP in LAN vs NAT

could somebody explain why I would need some public IP for an equipement inside the LAN while I could NAT it ? Why a company could be provided a full subnet of public ip and not just one for the ...
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1answer
92 views

RTNETLINK answers: File exists in alpine router

I already know that this ask may already be made here but i couldnt solve this there, idk if i made bad or something, so im asking with my own case, sorry if my english is bad but here it is this is ...
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1answer
438 views

how to configure dns mapping in netgear router for local server

I have a server which act as a webserver in our LAN. its ip address is 192.168.137.70 and it has local domain name mapping with name "kf.kobo.local" in hosts file I need to access the ...
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1answer
99 views

How does a node differentiate between an IPv4 and IPv6 datagram? [closed]

In a computer network, how do hosts and routers tell if a datagram is IPv4 or IPv6? Do they just look at the version number field of the packet header?
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25 views

Best practices for Docker Swarm et al and a firewall / router / proxy

I'm operating a Docker Swarm, so I have a few nodes with a bunch of services on them. In order to have a layer of protection, high availability, and just not having the swarm being connected to the ...
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1answer
160 views

Asus OpenVPN Server Static IP

I follow Static IPs for Asus router VPN clients. Still unable to let the client get static ip My method of executing openvpn is sudo openvpn --config /etc/openvpn/client/client.ovpn SSH connect to ...
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3answers
148 views

How to configure NGINX to route external request to my stage and production docker hosts

How to configure NGINX to route external request to my stage and production docker hosts I have 2 FQDNs stage.external.example.net and external.example.net that resolve to the same external public IP ...
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1answer
214 views

Client IP is seen as router IP by server when requesting server using public IP/domain by same-network client

I have been struggling with the above question for countless hours and haven't been able to find an explanation for the behavior either on this site or any other site for that matter. Might be me ...
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0answers
30 views

Transfer speed drops, resolved by pinging router

I have quite a peculiar issue going on with my network. I have a Synology NAS attached to a Cisco RVS4000 router, with IPS and firewall disabled, which I use to transfer files to from my Linux ...
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285 views

Unknown private IP addresses tried to log in to my router's admin panel

I noticed some weird traffic in my router's admin panel logs: 2021-03-25 06:27:19 [Critical][Config-Log] Terminal:WEB(10.181.189.71),Result:Fail,Type:Login,Username:- 2021-03-25 06:27:22 [Critical][...
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1answer
93 views

how to configure static lan ip to different router provided by isp?

We have got Vodafone Internet ISP. We asked for 5 public ip's. They had provided 1 wan ip and 5 lan ip pool. WAN Configured and internet working but LAN ip how to use, i need 5 static ip address to ...

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