Modern communication networks are built mostly on the concept of destination routing (although other concepts, such as source routing, do exist). In this concept, the sender of a data packet does not need to know where exactly to find the destination for that packet, all it needs to know is the ...
1
vote
1answer
30 views
How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?
The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running.
How any routing protocol packet reaches(flows of operations) ...
0
votes
0answers
21 views
How do I make all traffic from one network interface go through a PPTP VPN client connection on a FreeBSD router?
I have a FreeBSD 9 router on a Soekris net6501 with 4 network interfaces:
em0: DHCP, PPPoE connected via VDSL to my ISP (through modem in bridge mode)
em1: 10.0.1.0/24, LAN subnet
em2: 10.0.2.0/24, ...
0
votes
0answers
21 views
Routing dilemma in resilient multi-location web app infrastructure
In need of some help with understanding/resolving a routing challenge we're faced with – here is the scenario/assumptions:
A web application is running which is hosted in 2 physical locations, ...
1
vote
1answer
22 views
Linux networking and routing
I have 3 networks:
192.168.1.0/24
192.168.11.0/24
192.168.50.0/24
192.168.1.0/24 and 192.168.11.0/24 are connected to each other through an IPSec tunnel, and 192.168.11.0/24 and 192.168.50.0/24 are ...
0
votes
2answers
41 views
Default Route Configuration by IP Range
I have a scenario where I need responses on a certain range of addresses to go out through one default route and another to go out through another but don't know how to setup the route add commands to ...
0
votes
1answer
23 views
How to connect to hyperv guest machine by rdp through internet?
I installed hyperv and some client machines. Now i need to connect to any of client machine and host by using rdp through internet. This instruction tell me what i need to configure port forwarding on ...
-2
votes
3answers
74 views
Packets dropped due to NAT? Firewall? Unroutable private IP addresses?
Preliminary note
This question is out of academic interest. I know how to work around the limitation. I use this setup to control access from one subnet to the other on IP level which works great so I ...
0
votes
1answer
35 views
Understanding “forward” in linux
Which part of the linux is responsible for "forwarding" traffic between interfaces?
I know about "/proc/sys/net/ipv4/ip_forward" but which part of OS, kernel or a module is actually checking this ...
0
votes
2answers
56 views
Routing traffic so that it appears to originate from a single (static) IP address
We have three sets of computers: clients, a single proxy and multiple servers.
The clients (many) want to connect to the servers (many) using TCP on a specific and consistent port. Currently they do ...
1
vote
0answers
54 views
Forwarding traffic from TUN device (C++ backend) to the default gateway
The following problem is just a piece of the bigger solution I have a problem with. All other elements seem working so far, so I'll try to describe very small piece which I have problem with.
I've ...
0
votes
1answer
35 views
OpenVPN routing issue
We're using OpenVPN at a branch office to connect remote users and it's working very well for internal resources, but recently we've added a permanent VPN connection between the branch office and head ...
3
votes
1answer
37 views
“route add default -iface em1” in rc.conf on FreeBSD
I have two NICs on my FreeBSD server, which are set up like this in rc.conf:
ifconfig_em0="10.0.0.1 netmask 255.255.255.0" # LAN NIC
ifconfig_em1="DHCP" ...
1
vote
1answer
49 views
routing internet traffic to a remote host, leaving the local traffic alone
Here's the topology:
gw1 (linux): 10.20.1.1, 192.168.25.3
gw2 (linux): 192.168.25.1, 192.168.26.1
bridge: 10.10.15.2, 192.168.25.2
gw3 (linux): 10.10.10.1, 10.10.15.1
gw4 (ddwrt): 10.20.0.1, ...
0
votes
1answer
35 views
configuration of bridge to send traffic to external switch
I created 3 VM on top of KVM/QEMU (RHEL 6.0) using bridged networking. Created one bridge for eth1 and all the VM's are using that bridge for networking. All these VM's have the same subnet address. ...
2
votes
0answers
42 views
altnet parameter into pimd.conf file
I need to route a multicast streams in my private network.
I'm using pimd for multicast routing.
The multicast routing did not work until I put altnet <multicast_source_ip> masklen 24 to the ...
1
vote
1answer
41 views
DHCP wont give an IP to the Second NIC, Routing Questions
I have 3 NICS, one being a Wired network which connects to a wireless router, which is the primary network secured by WPA. Another being a Wireless USB Card I'm trying to setup to connect older ...
0
votes
1answer
24 views
Local server outside: How to access url internal over router?
i have the following problem: i installed a new test-mailserver in our office today and did some port-forwarding on our router to the specific mailserver ports. everything works fine, except the ...
6
votes
2answers
97 views
Traffic routing with unreliable connections
I have a group of offices that are all connected to the main office via DSL links on the far end to save costs. (We're a non-profit, don't ask)
We've historically had noticeable problems with the ...
0
votes
2answers
42 views
Workstation On Domain Cannot Connect To Internet
Here is my initial setup.
I have a router, a switch is connect to that router, on that switch is a Physical Server, on that server is a virtual machine (WIN2K8R2 192.168.1.21) and also on that switch ...
1
vote
2answers
62 views
Is it possible to assign a VLAN to an alias of network interface in pfsense?
My goal is to build a redundant pfSense cluster (as described in this article : http://doc.pfsense.org/index.php/Configuring_pfSense_Hardware_Redundancy_(CARP)
The problem is that i only have 2 ...
-1
votes
0answers
48 views
2 gateways on the same subnet — IPcop
I'm having a routing issue I was hoping to get help with.
Basically, we are installing an MPLS link to one of our sites but want to keep the internet traffic separate.
The setup looks a little like ...
0
votes
1answer
43 views
How to set network interface affinity under Ubuntu Linux?
I have a multihomed linux box with 6 network interfaces that I'm using to run some tests of router hardware. I would like to be able to set "NIC affinity" (for lack of a better term) on an arbitrary ...
0
votes
2answers
70 views
Routing between 2 subnets, using Hamachi as the link
I have got a small network consisting of a terminal. Each one has a PPPoE link to an Ubuntu PPPoE server. This network is working fine, and each terminal can ping every other and the internet - all ...
1
vote
2answers
131 views
Thoughts on network configuration in new office space
Within a month we're moving to a new office space for our company with ~ 35 people, and me, as the only system administrator, is in charge of setting up the new network for all four floors, and I'd ...
0
votes
1answer
60 views
Overcoming same private IP addresses, different subnets
I am preparing for migration to VMWare ESXi. Part of this involves P2V a large number of physical servers. Since a lot of our applications depend on the IP addresses to stay the same (i.e. they ...
0
votes
1answer
39 views
Gateway between wireless network and wired network not routing packets
I have the following interfaces/routes :
# ip route show
192.168.101.0/24 dev eth0 proto kernel scope link src 192.168.101.10
192.168.8.0/24 dev tun0 proto kernel scope link src 192.168.8.1
...
1
vote
2answers
77 views
Debian: IPv6-in-IPv4 over OpenVPN
Following (roughly) the instructions https://www.zagbot.com/openvpn_ipv6_tunnel.html at I now have the following:
Client
martin@theoria:~$ ifconfig
eth0 Link encap:Ethernet HWaddr ...
1
vote
2answers
75 views
Dynamically re-route specific traffic on NIC failure in Linux
This is my first question on this forum. Hope I will be able to help others in the future.
I have two boxes with two NICs each. I know that using bonding I can have some degree of fault tolerance ...
2
votes
2answers
106 views
Networking several devices with the same IP
I have a bunch of embedded devices that I need to flash with a custom OS.
On each device, the boot-loader (U-Boot) has a fixed IP of 192.168.100.2 and on boot it looks for a TFTP server at ...
0
votes
1answer
38 views
Combine two NIC's into one preserving routing (DMZ server / Windows or Linux)
We have a DMZ server with two NIC's, one is accessed from the Internet (public IP) and one from behind the internal firewall (private IP).
One application has problems to cope with a 2 IP's / 2 NIC's ...
7
votes
2answers
160 views
When an IP or a block of IPs are assigned to you, do the network admins just add them to a router?
Let's say there is a router to the internet and a router separates your network from others within a data center.
When the data center provided gives you IP addresses, do they just take a [set] of ...
1
vote
1answer
25 views
IPv6 MTU and MSS ignored in LAN?
I have a server with a (sixxs) IPv6 tunnel and a local network behind it. The tunnel has MTU of 1470, and a prefix with this MTU is advertised by radvd, and picked up by the local client:
...
1
vote
1answer
44 views
OpenVPN forwards client's public IP
My setup is like this:
192.168.1.0/24 - server lan
192.168.3.0/24 - vpn subnet
192.168.1.11 - vpn server
192.168.1.12 - apache server
openvpn server config
local 192.168.1.11
port port_number
...
0
votes
1answer
40 views
Need some explanations on iptables appended rules
Here are some rules that I append to filter table, and I list the added output related to each one:
$iptables -A INPUT -i eth0 -j ACCEPT
and the output is:
target prot opt source ...
0
votes
0answers
56 views
Route IP from one vlan to another vlan in the same vrf of the same router
Can you route a IP (/32) from one vlan to another vlan in the same vrf of the same router ?
Exemple:
example_router#show version
Cisco IOS Software, c7600s72033_rp Software ...
11
votes
1answer
131 views
What's the point of SAN routing?
I'm familiar with extending fabrics by adding more switches to it, but i don't get why sometimes it's better to do routing between fabrics (considering all the switches are from the same vendor, using ...
1
vote
1answer
142 views
Setting a static route in CentOS
Here is my route -n output:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 ...
0
votes
0answers
84 views
qnap TS239 and routing entries for VPN Connection
First, my network config:
192.168.24.x # my homenet
192.168.24.10 # Qnap with version (v3.5.2) installed
192.168.24.2 # VPN gateway (openSUSE 11.4)
192.168.24.254 # default gateway
The VPN Gateway ...
0
votes
2answers
79 views
BGP preferred outbound peer for given prefix when none of my peers directly announce the prefix (it's handled by the Default route)
I'm connected to 2 BGP peers; They both give me a filtered table that includes a default + about 30K prefixes each (not a full table). For prefixes that I do receive, I simply let BGP use it's ...
2
votes
2answers
73 views
Routing issue In OpenVPN
Below is my openVPN network topology. This is an example in openvpn cookbook.
here is my server config file(fedora is server):
proto udp
port 1194
dev tun
server 192.168.200.0 255.255.255.0
ca ...
2
votes
5answers
615 views
DD-WRT, forwarding TCP port 80 for http doesn't work from WAN?
I'm running DD-WRT firmware on my router, version DD-WRT v24-sp2 (12/12/11) std.
I'm trying to port forward http traffic on port 80 to my PC's local IP, 192.168.2.97, and although I can browse my ...
0
votes
0answers
29 views
Outgoing (hardware) load balancer and gateway and DHCP
Here is the scenario:
Two (or more) aDSL routers --> Internet
192.168.1.1
192.168.2.1
...
/\
|
|
\/
Hardware Load Balancer
192.168.255.1
/\
|
|
\/
...
2
votes
1answer
52 views
Sharing internet connection on Windows XP with 2 NIC's and seperate networks
This is the basic setup. The goal is to get Host 2 to use Host 1's second NIC to connect to the internet without using any special routing software or anything on Host 1.
What I can do: Configure ...
-1
votes
2answers
88 views
Dnsmasq on Tomato firmware won't reply from simple name address
I want to be able to access computer 192.168.0.3 from the simple name "pos". Not "pos.com" or anything. With my setup below I can ping dev.pos, just not pos. I have to ping mydomain.pos to get a ...
1
vote
2answers
81 views
Selecting gateway on application level on Linux
I want to decide on application level which gateway to use to connect to the internet.
It can't be done by simple subnet rules, because it is really the application which should be able to decide ...
0
votes
1answer
23 views
How OSPF Support Classless Domains
Link state Packet in OSPF contains :
1.Identification Number of sender.
2.Sequence Number.
3.Network Number.
4.Cost or metric.
5.Next Hop.
i am not able to understand how OSPF support variable ...
1
vote
1answer
30 views
Is it possible to have dynamic proxy_remote_match directives in apache2 or work around it somehow?
I am running a forward proxy, where I want to forward certain requests to different proxy servers using ProxyRemote. Which request goes to which server depends on many factors (time, load, url, host, ...
-1
votes
0answers
43 views
OSPF Convergence [closed]
Network convergence as the process of synchronizing network forwarding tables after a topology change.Please can some explain clearly what are the steps in OSPF Convergence and how is it better than ...
-2
votes
1answer
88 views
when choose OSPF and when RIP [closed]
A question asked in Cisco Interview :
Which routing protocol will you use if you have 50 nodes in each area? Choose between OSPF , RIP and explain.
Edit:
I worked with the above Question and came up ...
1
vote
3answers
213 views
How to configure ubuntu server with 2 NICs, and 2 Gateways (2nd as a failover)?
Here is a basic overview of the network configuration for one of our servers:
[Datacenter]
[Internet Connection #1] >> [Firewall 1 (xx.xx.xx.1)] >> [Server (xx.xx.xx.10)]
...
