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Questions tagged [ip-routing]

272 questions
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iptables asynchronous NAT. packets drop after prerouting table

I have a Centos server acting as a NAT in my network. This server has one external (later ext1) interface and three internal (later int1, int2 and int3). Egress traffic comes from users via int1 and after MASQUERADE goes via ext1. Ingress traffic…
Shamanu4
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IP Routing: How is a dynamic route built on a router?

So I understand that to forward a packet, a router needs 3 pieces of information: next hop, egress interface and Adjacency (L2 information). On a Cisco router, this will be stored in FIB and CEF. What confuses me is that it appears next hop is…
wei
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Forwarding web traffic from one IP to another

We host a web site for a client that is not responding to our requests to change their "A" record for the site (they own the domain). We are migrating soon and we cannot wait for them, nor do we want their site to be down once we migrate. Is there a…
tacos_tacos_tacos
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Linux route cache shows high RTT for loopback - is it normal?

Here are parts of route cache from three different servers that are NOT under high load. # ip route show cache | grep -B 1 rtt local 127.0.0.1 from 127.0.0.1 dev lo cache mtu 16436 rtt 106ms rttvar 155ms cwnd 7 advmss 16396 hoplimit…
darkk
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Network topology for both direct and routed traffic between two nodes

Despite it's small size, this is the most difficult network design problem I've faced. There are three nodes in this network: PC running Windows XP with an internal WiFi adapter.Base station with both WiFi and a Wireless Modem (WiModem)Mobile…
IndigoFire
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Routing my home traffic to another server instead of ISP's default routes

I suspect my ISP has rather poor peering arrangements, causing slow access to several sites that I regularly visit. I determined that fact by proxying my web traffic to a server that I've placed in a data center somewhere nearby and seeing…
feicipet
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proto static metric for overlapping prefixes

Can someone please clarify how the route metric is set by Centos 8 in the following situation. I have two vlans on the system, each of which has a matching route prefix defined in /etc/sysconfig/network-scripts/route-vlanXX. ip route show gives the…
SlyOne
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Cannot connect to Flask server via public IP, only private IP

I have a simple Flask server that echos requests it gets to the terminal. Requests I send it via the device's public IP address do not register. The flask server is started correctly on all interfaces with .run(host="0.0.0.0", port=5000,…
GiovanH
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linux - routing between bridge networks without overlay

Here's the scenario. There are two hosts in a subnet (both are virtualbox VMs) and both are on the same network 192.168.1.0. I've additionally created two bridge interfaces with separate network slices. Question: Is there a way for the ip on host1…
manikawnth
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How Akamai CDN serves the content from closes edge server to user ?a

After going through some resources on google, got the idea how Akamai CDN edge servers works but got some questions about internals. Say I have got static content cached at Akamai CDN(XXX.XX.XXX.XXX say in seattle) for my site…
user3198603
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Windows Server 2016 Hyper-v host 3 websites in 3 VM with One Public IP

Installed is Windows Server 2016 DCE as host OS. I want to host three websites on three different guest VMs under this host. I got one public IP (5.189.175.xxx), which is assigned to the host. No Website or IIS is currently running on the host. I…
Admin
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Route internet traffic through one nic and local traffic through a second nic

I am trying to route traffic through a specific interface based on its destination. OS is CentOS 7. I am setting up a mini MPI farm where I have 2 slave workers and one master. The master and slaves use the built-in nic (em1) to communicate locally…
Matt Schramm
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Windows Server - Redirect Traffic To Another Subnet

on windows server 2012 I have 2 network cards, one of them connects directly to the router on static ip 192.168.1.11 and that second card I have a second ip set as 192.168.1.12. From the router I forward the port 22 to 192.168.1.12 which hits the…
Glen Elkins
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Forward traffic to remote external IP through a specific interface

Network Diagram I have 3 servers with two interfaces each, as shown in the diagram. The servers communicate with each other through the interface enp1 and to the world through the interface enp0. For some reason, the servers can not communicate…
alixander
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Windows routing without gateway (but through interface). Is it possible?

I have a custom network setup. My servers have what I would call "main IP" with gateway for example: Main IP: 67.166.214.148 Netmask: 255.255.255.0 Gateway: 67.166.214.1 And then I have additional IP addresses which are routed to the server…
A. Smith
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