Questions tagged [routing]
Questions about using a router/networking, e.g. port forwarding, VPNs
2,824
questions
198
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13
answers
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How can I make the Windows VPN route selective traffic (by destination network)?
I want to use a Windows VPN but only for a particular network, so that it doesn't take over my entire network connection.
e.g., Instead of the VPN becoming the default route, make it only the route ...
- 5,910
134
votes
14
answers
122k
views
What is the exact use of a MAC address?
I understand that IP addresses are hierarchical, so that routers throughout the internet know which direction to forward a packet. With MAC addresses, there is no hierarchy, and thus packet forwarding ...
119
votes
7
answers
45k
views
IP address that is the equivalent of /dev/null
Is there an IP address that would result in any packet sent to be ignored (blackholed)?
I know I can always set up a router with an IP address and then just have it ignore all packets sent to it, but ...
- 6,151
98
votes
5
answers
255k
views
OpenVPN: Only route a specific IP addresses through VPN?
On a remote private network there are two servers -- a file server and a database server (these are both Win machines, in case it matters).
The file server has its own fairly robust authentication ...
- 3,301
81
votes
3
answers
53k
views
How do you get loopback addresses other than 127.0.0.1 to work on OS X
According to everything I read, the entire 127.x.x.x subnet should loopback.
However, on my Mac, I can only ping 127.0.0.1
I know I've done this before (though possibly on another OS) and has come ...
- 913
69
votes
2
answers
123k
views
What is the difference between ARP binding and DHCP address reservation?
In my TL-WR1043ND I have these functionalities and both of them pair an IP address to a MAC address. What is the difference?
I read that ARP is for security reasons, others say it is for Wake-on-LAN. ...
- 5,234
65
votes
10
answers
223k
views
How to direct IP route through specific interface in OS X?
I'm on a mac and trying to route a particular address though a specific gateway on my wifi connection.
I'm using:
route add -host 54.81.143.201 192.168.15.1
Sometimes this will work, other times it ...
- 809
52
votes
8
answers
70k
views
How to force split tunnel routing on Mac to a Cisco VPN
Any one know how to hack the routing table (on a mac) to defeat the forcing of VPN routing for every thing over a cisco VPN? pretty much what I want to do is have only 10.121.* and 10.122.* addresses ...
user23601
50
votes
2
answers
47k
views
Does All LAN Traffic Travel Through A Router
I have a very simple question: if I have a router (DHCP enabled - leasing IP addresses between 192.168.0.2 and 192.168.0.254) with a switch plugged in, and I plug two computers into the switch, will ...
- 898
49
votes
9
answers
10k
views
Why are subnet-masks relevant for the individual computer on the network?
I understand how subnet-masks are used to divide a network into sub-networks, but, why does every computer in the network need to know the subnet-mask and not just the router?
I could understand it, ...
- 612
42
votes
3
answers
141k
views
How to route only specific subnet (source ip) to a particular interface?
How to route only specific subnet (source ip) to a particular interface?
OS: Linux
I know I can do easily by destination IP by using something like
route add 1.2.3.4/24 dev eth4
but I do not ...
- 1,155
42
votes
1
answer
34k
views
iptables vs route
What's the difference between these two tools?
Can anybody tell me what the main workflow of networking behind Linux (in relation to IPv4 packet filtering, NAT and IP routing table) is?
- 1,280
41
votes
3
answers
9k
views
What's 24 in "192.168.15.0/24"?
What's the meaning of /24 in the following command?
route add -net 192.168.15.0/24 192.168.8.10
- 3,054
39
votes
8
answers
143k
views
Access internal IP using public IP
I have a DSL modem with a public IP address (201.206.x.x), and I have a web server in my internal network (192.168.0.50).
I set up the modem to forward requests to port 80 to my web server, so, if I ...
- 683
37
votes
3
answers
111k
views
On Windows, how to determine route for IP destination?
How can I determine the IP route taken for a specific IP destination (without looking at "route print" and figuring it out manually)?
In OS X there's route get 1.2.34 and in Linux there's /sbin/ip ...
- 1,814
35
votes
4
answers
7k
views
How smart is my network?
There is an argument within my office about how smart/efficient the network we have set up really is.
We have a fibre line and a cable line running into a load balancing router, which has a hardware ...
- 479
34
votes
5
answers
5k
views
What stops an internet router from sniffing my traffic?
Packets travel through internetworks, and take many routes through internet routers.
On each route that forwards traffic to another until reaching the ultimate destination, what stops them from ...
- 495
34
votes
6
answers
8k
views
I have a domain, static IP address and many devices I'd like to access outside my house. How do I route them?
I have a domain (e.g. example.com), static IP address (e.g. 212.5.5.5) and local devices at 192.168.0.1:80, 192.168.0.2:80, 192.168.0.3:80, 192.168.0.4:80, 192.168.0.4:47 (this one is not a website).
...
- 343
34
votes
3
answers
69k
views
Add an "on-link" routing entry
On Windows 7 I have been using the command route add to add routing entries with a gateway. I now want to add a routing entry with no gateway, where the route is directly reachable.
Windows 7 calls ...
- 3,485
32
votes
4
answers
46k
views
Route the traffic over specific interface for a process in linux
Is it possible to route the traffic used by a process over a specific interface?
For example, network traffic by download application should always use the interface wlan0 whereas all other ...
- 583
32
votes
3
answers
129k
views
"Network is unreachable" when attempting to ping google, but internal addresses work
I can get to other PCs in my house on the 192 network, but trying to go outside gives me the "network is unreachable" message. p3p1 is up with a good IP Address. Running Fedora 16. What should I ...
- 2,404
32
votes
5
answers
3k
views
How do I tell Windows to use 802.11 in preference to 3G?
I have a Samsung NC-10 netbook which I take to work every day. Most of the time I use it just on the train/bus, but I also use it at work and home.
It has a built-in 3G card which I want to use when ...
- 5,144
31
votes
2
answers
95k
views
Route all trafic for specific ip over specific network interface
I have a linux server that needs to get some routing. I'm fairly new at this and i don't find any clear source on google.
The setup should be simple:
All traffic to a server on ip 192.168.72.20 ...
- 413
30
votes
3
answers
10k
views
Why can I ping 10.0.0.0/8 addresses from a 192.168.1.0/24 subnet?
My home network uses a 192.168.1.0/24 subnet, and when I ping 192.168.1.137 I get a response saying the host is unavailable (as expected because I don't have any machines using that address)
However, ...
30
votes
5
answers
40k
views
How do IP answer packets reach their destination inside of a private LAN? [duplicate]
This is a little theory question that has been confusing me for a pretty long time.
Basically, if we are inside of a private LAN, and we want incoming packets to reach, for example, an HTTP server ...
- 301
30
votes
7
answers
33k
views
Does DD-WRT QoS actually work?
There have been various reports of DD-WRT QoS not working (here, here and elsewhere).
The DD-WRT QoS Documentation mentions some checks would indicate whether the proper priorities are being applied ...
- 744
29
votes
2
answers
33k
views
Does the order of entries in the routing table matter?
Does the routing order matter:
> route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
123.x.x.151 0.0.0.0 255.255.255.255 UH ...
- 1,367
26
votes
5
answers
85k
views
How to tell Windows 7 to ignore a default gateway
I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192....
- 2,337
26
votes
1
answer
86k
views
NAT vs. port forwarding [duplicate]
Possible Duplicate:
What is port forwarding and what is it used for?
What is the difference between NAT and port forwarding? Are they two different names for the same thing? What would be a short ...
- 555
25
votes
4
answers
234k
views
"Connection refused" vs "No route to host"
I have an Apache server running on a server:
[root@te-srv2 ~]# ps -ecf|grep httpd
root 698 32047 TS 19 10:45 pts/24 00:00:00 grep httpd
root 32081 1 TS 19 10:16 ? 00:00:00 /...
- 1,807
25
votes
3
answers
80k
views
How to map an IP adress to localhost?
I want to map the IP address 192.168.1.222 to 127.0.0.1 so that if I use 192.168.1.222 in the web browser or ping command I get the response (and that from my 127.0.0.1).
Is this possible via ...
- 373
24
votes
4
answers
22k
views
What's the meaning of link#4 in mac's route table?
jichaodeiMac:~ jichaoyang$ netstat -r
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default openwrt.lan UGSc 10 ...
- 7,570
24
votes
1
answer
35k
views
Does the traffic go through my company network when I browse when connected through SSL-VPN
I work for a company which is not in my country. The enterprise intranet is in a different country. We do not have many employees in my country - so everyone works from home. When we need intranet ...
- 583
22
votes
2
answers
1k
views
Internet Sharing on Lion breaks my routing table
When in the office, I'm connected to a 192.168.1.0/24 network. When Internet Sharing is off, the first entry of netstat -nr is
default 192.168.1.254 UGSc 10 62 en0
...
- 321
21
votes
2
answers
35k
views
Route only specific traffic through VPN
I've looked up previous people asking similar questions, but have yet to get a straight answer that will work for my given situation, so here goes..
I'm running on Linux (Fedora 22) and have a VPN ...
- 419
20
votes
4
answers
32k
views
How do I setup Ubuntu/Linux's Network manager to selectively route network traffic through the VPN?
I'm using Ubuntu 9.04 and I just noticed that ALL of my network traffic is being routed through my VPN. I would like the VPN to route only the traffic hitting servers on the VPN and then connect ...
- 494
20
votes
4
answers
66k
views
How can I ping via an alternate gateway?
Our network has two modems, each one hidden behind a router. The primary router is on 10.1.1.1, the backup router is on 10.1.1.2, and are both configured to the 10.1.1.0/24 subnet. Both routers have ...
- 343
20
votes
1
answer
24k
views
What does 0.0.0.0 gateway mean in routing table?
I am new to being a Linux system admin and I am learning about routing tables.
Currently I have two interfaces in my virtual machine:
vagrant@vagrant-ubuntu-trusty-64:~$ ifconfig
eth0 Link ...
- 331
20
votes
4
answers
34k
views
How to set up application-specific routing table on Windows?
Suppose network interface 1 (net1) and 2 (net2) are both connected to the Internet. I want application 1 (app1) to use net1, and application 2 (app2) to use net2. How can it be done under Windows?
If ...
- 5,345
19
votes
3
answers
22k
views
What is "Disable class based route addition" good for?
In the advanced TCP/IP settings of a Windows VPN connection, I found a checkbox labeled Disable class based route addition. The checkbox is only enabled as long as Use default gateway on remote ...
- 293
19
votes
2
answers
23k
views
How does the router know which device to send packets to? [duplicate]
my question does not concern how it moves through the internet, but how it moves through the router to a certain device. All devices connected to a router in a home network have the same external IP. ...
Dan Webster
18
votes
2
answers
8k
views
How do I make certain web addresses use a specific network adapter on Mac OS X?
I have two Internet connections at work, my wired Ethernet connection (which is heavily filtered behind a firewall, can't connect to Apple Updates, etc.) and a wireless connection that is unfiltered. ...
- 283
16
votes
2
answers
19k
views
Stop VPN being used on internet traffic on Win 7 [duplicate]
Possible Duplicate:
How can I make the Windows VPN route selective traffic (by destination network)?
How To Use Local Internet Connection To Access Internet While Still Connected with VPN
I am ...
- 337
16
votes
3
answers
93k
views
Can't add default route - RTNETLINK answers: Network is unreachable
On an Ubuntu 14.04 server (3.16.0-30) I'm trying to add a default route and getting error as follows:
ip route add default via 172.16.111.99 dev bond0.11
RTNETLINK answers: Network is unreachable
...
- 413
16
votes
3
answers
29k
views
Is it possible to have 2 different VPN connections simultaneously on the same machine? maybe on different network interfaces?
I am setting up a new cluster in my new workplace, and I am still administering another cluster in my last work place. Basically I am "copying" the configuration of the first one to setup the new one.
...
- 248
16
votes
5
answers
92k
views
Rerouting local LAN and Internet traffic when in VPN
I'm connecting to a VPN which doesn't allow split tunneling and basically reroutes my Internet traffic through, which is slow. Additionally and more importantly, this also effectively removes my ...
- 2,789
16
votes
3
answers
40k
views
SSH server can't be connected to when VPN is turned on
I recently found that when my workstation connects through a VPN connection then its SSH server can't be connected to from a remote site. I am sure it's a routing problem because the the VPN client ...
- 261
15
votes
2
answers
705
views
How on earth can this reported hour-long ping time be real?
I recently spent the Easter bank holiday with my parents, who live in a very rural area in the UK. They have a (terrible) ADSL internet connection, which is run over several kilometres of dodgy copper ...
- 151
14
votes
1
answer
6k
views
Can someone explain a tracert to my own public IP?
I'm trying to learn about ip routing and I'm am trying to trace route my own public IP. I just searched my ip online and tried it. the results I got were
> tracert [my_public_ip]
1 <1ms 192....
- 357
14
votes
2
answers
59k
views
Windows 7: how can I add an IP range in the "route" command?
I'm using two network connections, and I tried using the "route" command so that when I access a specific internal IP on my LAN, it would use connection 1, anything else would go normally through ...
- 373