the process by which data packets on communication networks are forwarded into the direction of their ultimate destination by routers.

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0
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1answer
180 views

config linux router to allow ftp

I recently setup ESXi on a dedicated server and I tied to use /29 IP subnet for my VMs, due to datacenter policies I have to run A router-VM on my ESXi to route traffic to/from VMs. I get a single IP ...
2
votes
0answers
120 views

Why might one host be unable to access the Internet, when it can ping the router and when all other hosts can?

I have a Draytek Vigor 2830n. It's kicking out a 192.168.3.0 LAN. It performs load-balancing across dual-WAN ports, although I've turned off the second WAN to simplify testing. There are many hosts ...
1
vote
3answers
5k views

Make CentOS 6.x a port forwarding NAT device

I would like to make CentOS a port forwarding NAT machine using iptables. This is the first time I've tried this and I think i might need a little help. This is the configuration i'm trying to ...
-1
votes
1answer
630 views

Getting packets from one port to another on a Dell PowerConnect 2824 switch

I have a dell PowerConnect 2824 and I have a cat 5 cable connected from port 1 to port 23. Port 1 is reserved for VLAN 1 (the only VLAN that can manage the switch) and port 18-23 belong to VLAN 112. ...
0
votes
1answer
767 views

How configure multiple IP Failover on the same VM?

I'm trying to configure multiple IP Failover on the same VM behing Proxmox VE. I've got these IP : IP1, IP2 and IP3. IP1 is the main one. I've configured in Proxmox these IP in veth with theses infos ...
1
vote
2answers
666 views

Route a specific user's traffic via VPN but still allow local networking

So, I want to route certain traffic via a VPN connection and the rest via my normal Internet connection. I want to run several different programs and most of them don't support binding to a specific ...
1
vote
0answers
100 views

Linux iptables NAT

So I need to setup a server that servers a NAT server for IPMI network xxx.xxx.xxx.xxx = external IP(internet IP) aaa.aaa.aaa.aaa = internal IP A bbb.bbb.bbb.bbb = internal IP B User 1 -> xxx....
17
votes
2answers
762 views

RFC 1918 address on open internet?

In trying to diagnose a failover problem with my Cisco ASA 5520 firewalls, I ran a traceroute to www.btfl.com and, much to my surprise, some of the hops came back as RFC 1918 addresses. Just to be ...
-1
votes
2answers
2k views

using server as default gateway with static routes [closed]

Given a server or workstation (e.g. windows7, windows server 2008R2) with 2 NICs, can I use it as a simple gateway between 2 LAN segments using only static routes, or do I need to set up additional ...
1
vote
4answers
2k views

Securing a guest VM to give it internet access, but block access to host LAN

I have a Linux guest VM running under a Windows host. If I set the networking mode to NAT, the guest can get internet access (which I want), but can also access the hosts LAN (which I dont). For ...
0
votes
1answer
316 views

Proper way to connect Cisco Small Business Switches? [closed]

First time network engineer here. I don't have a large budget, so I need to learn all of the skills necessary without pulling in a bunch of vendors. I'm charged with building out a 350port network in ...
0
votes
1answer
223 views

Forward packets on different private IPs and interface aliasing

I have a server with 2 public IPs. I configured interface aliasing to hold the second IP: # ifconfig vmbr0 Link encap:Ethernet HWaddr 4c:72:b9:4f:18:5f inet addr:public.ip.number.1 ...
2
votes
2answers
120 views

Cisco Network Object NAT to get Internet?

So I've inherited a Cisco ASA 5505, and I have no experience whatsoever with the things! There are two Network Interfaces both WAN facing, and the LAN interface of course. Now in NAT rules, there are ...
0
votes
1answer
116 views

Site to Site VPN Tunnels

This is more of a theoritcal question then a problem. With regards to Site to Site VPN links, let's for the sake of the question say we have two Sonicwall Firewalls. Site A and Site B SonicwallA ...
1
vote
0answers
3k views

Setting up Windows Server 2012 Foundation to route all Internet traffic through an OpenVPN connection using RRAS

First of all I'm not (yet) a fully trained IT professional but just a college student so please forgive me if some of the things I'm about to ask might seem "stupid" because the answers are totally ...
0
votes
1answer
125 views

Site-To-Site VPN Failover

Conceptually, how does this work/ would be configured in a Cisco environment, I realise this is quite an open question so please let me narrow it down. Let's say we have two sites: SiteA and SiteB, ...
0
votes
0answers
113 views

tunnel two windows or linux server with routing packets

I would like to use IPIP eoip tunnel for windows/linux. In addition, It's not necessary to be IPIP, I want to route connection from server 1 to server 2. You can see following flowchart: http://i44....
0
votes
1answer
377 views

Route being ignored on core Cisco 6500 switch?

This is less likely a bug, and more likely a lack of my own understanding on routing. I am having an asymmetric routing issue where return traffic is going out the wrong firewall. I have an explicit ...
1
vote
1answer
332 views

SUSE YaST routes not in kernel route -n

I'm using opensSuSE as a router. eth0 is the WAN nic, eth1 is the LAN nic. I also have a tun10 device, which I'm using with an OpenVPN client connection. I want yast routes to specify what traffic ...
2
votes
1answer
5k views

How to set mark on packet when forwarding it in nat prerouting table?

I have a few port forward rules like this iptables -t nat -A PREROUTING -p tcp --dport 46000 -j DNAT --to-destination 172.16.8.2:46000 iptables -A FORWARD -p tcp -d 172.16.8.2 --dport 46000 -j ACCEPT ...
3
votes
3answers
15k views

Properly configure two eth interfaces on different subnets

Can anyone with heavy background in both Linux and Networking help me out? I've scoured the Internet looking for a clear answer for this and I've even compared a box I have access to with the same ...
0
votes
1answer
528 views

Policy Based Routing Not Working

We've just implemented a secondary internet connection. It will be used as pure failover so for the time being I just want to avoid async routing issues. I've setup 2 routing tables: fw1 ~ # ip ...
4
votes
0answers
1k views

IPv6 routing over OpenVPN

Trying to learn how IPv6 works with OpenVPN, so I wanted to setup following scheme. I have a VPS server (Ubuntu), which have been allocated a /48 subnet. ISP ipv6 gateway is XXXX:XXXX:XXXX::1 Server ...
-2
votes
1answer
85 views

Layer 3 switching in data center [closed]

I have currently 3 uplink ports in the data center with 3 different subnets. They connect to 3 servers. I want to make it only 1 uplink and connect it to a switch so ip addresses can be accessible ...
0
votes
1answer
529 views

Configuring routing for network faults simulator

I'm trying to configure routing on my test machine to pass all traffic via the network errors simulator (WANem). WANem runs in a virtual machine, in the same network with internet gateway. It has NAT ...
1
vote
2answers
1k views

Routing through OpenVPN gateway

I have the following setup: ++++++++++++++++++ + OpenVPN server +........ . . . . (cat pictures) ++++++++++++++++++ | | __|...
0
votes
1answer
184 views

ipsec routing / strange routing behavior

I have following network configuration: Office1 <-- openvpn --> office2 <-- ipsec tunnel --> branch office Office1 and office2 are on Debian, Branch office: juniper srx100 Office1 ...
1
vote
0answers
88 views

Smartphone conflicting with LAN?

Recently, I've been having sporadic problems with internet connection on some computers. It turns out that an IPhone, when connected to the wlan, was causing this. These computers with Internet ...
7
votes
2answers
2k views

Routing via Cisco ASA is changing TCP sequence/ACK numbers

Our network has a dedicated VPN appliance that sits inside the office network. We have a Cisco ASA with a static route that routes the VPN subnets to the VPN appliance. So a typical request from the ...
2
votes
1answer
2k views

How to get Juniper SRX220 to respond to multiple IP Addresses

How can I get an SRX220 to respond to multiple ip addresses on same subnet, but with different gateways. e.g., Subnet: 1.1.1.40/30 (.41 gateway, .42 actual ip) Subnet: 1.1.1.44/30 (.45 gateway, .46 ...
1
vote
0answers
43 views

Redirecting OpenVPN Server routes towards other VPNs to clients

I have an openVPN Server that share a network in tun mode, the main network that it share is on the class : 192.40.190.0/24 . The config file that I have on the Server is like the following : local ...
2
votes
1answer
2k views

Company VPN on same subnet as home network

My company has a PPTP VPN (I know it's not very secure) on a 192.168.1.0 /24 subnet. For people connecting from their home networks, file sharing doesn't work if their subnet is 192.168.1.0 /24. Some ...
-2
votes
1answer
69 views

vlans communicate with each other

I am setting up three vlans in a cisco router with the following configurations. Vlan 10 Subnet: 192.168.1.0/24 Netmask: 255.255.255.0 Gateway: 192.168.1.1 Vlan 20 Subnet: 192.168.2.0/24 Netmask: ...
0
votes
0answers
856 views

How to enable multicast routing in TMG 2010?

I have a TMG 2010 firewall between some office networks, which handles routing and firewalling; I need to let some application-specific multicast traffic flow between these networks; this is UDP ...
2
votes
1answer
371 views

Linux bridge static IP using only one NIC

It seems like I have a generic problem, but can't find any solution - every solution that I found so far on internets doesn't work for me. Let me first try to explain what I am trying to do - I have a ...
-2
votes
3answers
2k views

Redirect Outbound HTTP to port 53 iptables [closed]

I am new to iptables and would like to reroute all outbound HTTP traffic on my router from port 80 to port 53. Is this possible? Thanks in advance for any help. Eric *Edit I ran iptables -t nat -...
0
votes
0answers
66 views

Is there a way to diagnose *where* comms to a port on a windows machine is being blocked?

I am developing a system that comprises an email server. I have so far been unable to connect on port 25 (using telnet), despite having checked the following are set up correctly. Connections to port ...
1
vote
1answer
434 views

iptables: Allowing only established outgoing connections like DMZ

I want to simulate a DMZ like scenario where server1(inside DMZ, 10.1.1.0) should be able to respond to any incoming connection and cann't make a new outgoing connection on its own. I would ...
-1
votes
1answer
490 views

Linux server not routing my packets

I have a linux server (Ubuntu 12) with 2 NIC's. eth0 is connected WAN (inet 10.0.2.15 mask 255.255.255.0) eth1 is connected LAN (inet 192.168.0.1 mask 255.255.255.0) I want my windows machine to ...
0
votes
1answer
117 views

failure discovery using LLDP

I have a array of switches connected to an Openflow controller.I want to understand the topology of the switches.I am thinking of using LLDP for this.Now in this architecture if a link goes down or a ...
0
votes
1answer
105 views

Why can't we contact a specific address range from inside our LAN?

We can't connect to a specific external server from inside our LAN. However we can connect to the same server from outside our LAN, at home, or using a mobile phone. It was working just fine for ...
0
votes
1answer
842 views

Windows 2 NICs 2 Networks - Routing Issue

I have a Windows Server Box with 2 NICs sitting in 2 Networks with a Gateway Router to a 3rd: e.g.: A: 10.1.1.0/24 - Remote Network B: 172.1.1.0/24 - "DMZ" with GW Router to Network A on IP 172.1.1.1 ...
0
votes
2answers
41 views

Prevent internet access except for one server?

I want to see if the HTTP proxy support for an application is working correctly. In order to check this I have installed a Ubuntu VirtualBox on my Mac laptop and I want to configure the virtual ...
0
votes
1answer
70 views

RIP v2 summarisation

I am learning ccna, and doing some practice on packet tracer. I have a simple network with two routers, R0 and R1. They are connected to each other through a serial link (172.16.56.128/30). R0 is ...
0
votes
1answer
340 views

openvpn routing setup for incoming connections on client

I have a debian server, call it A, that is connected as an openvpn client to another network. Server A is also http and email server accepting connections from the internet. Now, one of the servers on ...
1
vote
1answer
998 views

redistribution OSPF RIP of directly connected networks

I am trying to learn redistribution between RIP and OSPF. I am using packet tracer. I have one router BRANCH that is configured with RIP v2. On fa0/0 there is the network 172.16.56.0/25, on fa0/1 the ...
0
votes
1answer
2k views

iptables with DNAT and multiple gateways: How to route replies to correct gateway?

I have a problem setting up iptables rules and routes on a Linux client for a scenario with DNAT and multiple gateways: We have two gateways to the Internet. The first has a fixed IP, the second ...
1
vote
1answer
103 views

How can I access my router that is on other office network

Hi I'm working on ROUTER A and I want to access ROUTER C, the config is: ROUTER A <-conected with-> ROUTER B <-conected with-> ROUTER C ROUTER A: LAN:192.168.1.1 255.255.255.0 WAN:79.189.60....
0
votes
1answer
71 views

Routing 4 Networks

I've been trying for almost a week to make it work but without success. I start to be hopeless. I have 4 ethernet adapters : 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN ...
2
votes
3answers
869 views

Why would IGMP and MLD be required to forward unregistered packets to all ports?

First, a little background: My understanding is that the purpose of IGMP (and its IPv6 cousin, MLD) is to avoid wasted bandwidth by ensuring that multicast packets only get transmitted to ...