Questions that include employing tools of the IPROUTE2 Utility Suite, especially ip and tc.

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What's the “default” routing table for in Linux?

When I list the routing rules in my Linux desktop, this is what comes up: $ ip rule 0: from all lookup local 32766: from all lookup main 32767: from all lookup default I've used routing rules ...
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98 views

Simulate ethernet cable unplugged on a remote machine while staying connected

I am working from home on remote embedded Linux machine "X" via ssh. It has one physical network card. I need to simulate Ethernet cable unplugged condition on the same remote machine "X" , while ...
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19 views

IPTables/IPRoute + Avoiding VPN

I have a debian jessie headless server running an OpenVPN connection. However there is certain traffic I don't want passing through the VPN, and would rather pass through my local gateway. I have ...
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2answers
34 views

Configuring 2 NIC with 2 gateways

Lets say my router has a LAN (192.168.0.1/24) and a DMZ (192.168.1.1/24). My computer has 2 NICs, one for LAN and one for DMZ. How can I configure my routes so that it uses both gateways instead of a ...
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1answer
32 views

Meaning of address and route scope

I've been searching information concerning the meaning of scopes both in addresses and routes but I don't understand the documentation I've read so far. This is what I've been reading: man 8 ip http:...
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1answer
76 views

Configure multiple interfaces with DHCP on CentOS

I am trying to get a DHCP-assigned address for a veth device (veth-inside) inside of a network namespace (myns) on CentOS 7, but dhclient is already running. The veth peer device (veth-outside) is in ...
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25 views

'ip netns exec' command execution using nsid obtained from 'ip netns list-id'

I have previously used ip netns exec command to modify netns interfaces. But if there is no name associated with a netns (eg: docker), how can I use nsid result of ip netns list-id command for ...
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20 views

Routing policy is not working

I have an Access Point with OpenWrt. On other host of the same LAN there is a squid (IP Address 192.168.80.148). I'd like to route packages with destination port 80 to 192.168.80.148. So I have root@...
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32 views

How to determine the logical type of a linux network device

with logical I mean everything legal in the command ip link as in, for instance: ip link add link dum0 name dum0.200 type vlan protocol 802.1Q id 200 where the logical type would be "vlan". All ...
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2answers
209 views

Meaning of “route add -host xxx.xxx.xxx.xxx dev eth0:1”

if the format is: route add -host 192.168.1.20 gw 10.1.1.20 dev eth0:1 I know, It will route 192.168.1.20 to 10.1.1.20 Then, what's the "dev eth0:1" mean?
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88 views

Simulate a network cable unplugged without login all routes

I want to simulate unplugging a cable from a Linux instance. My initial response was ip link set eth0 down. However, this command has impact on higher-level networking functions, e.g. routes (...
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51 views

Why could policy routing on iptables marks applied in FORWARD or OUTPUT chains be inconsistent?

I am routing HTTPS connections down a SSH tunnel (-w) using iptables marks and iproute2 rules, the reasons I need to do it this way are contrived, to say the least, so most alternate solutions may not ...
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1answer
45 views

ss not showing all ports being listened on

After doing a ssh -fND 1080 localhost, ssh will listen on port 1080 to provide the SOCKS service: box:~$ netstat -ln|grep 1080 tcp 0 0 127.0.0.1:1080 0.0.0.0:* ...
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84 views

How to make an iproute2 bridge setup permanent?

I've set up an archlinux inside a Oracle Virtual Box. To be able to reach the VM from the LAN I have added a bridge adapter and configured the guest system following the instructions from the Arch ...
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3answers
557 views

alternative to “netstat -s”

netstat -s prints out a lot of very detailed protocol statistics like number of TCP reset messages received or number of ICMP "echo request" messages sent or number of packets dropped because of a ...
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1answer
73 views

linux how to config route etc/network/interfaces?

how to config route in etc/network/interfaces ? i want add 3 route in eth0 and eth1 i have try to configure like this: auto lo iface lo inet loopback auto eth0 iface eth0 inet static ...
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1answer
467 views

How can I bridge two interfaces with ip/iproute2?

I know how to create a bridge using brctl, but I have been advised not to use this anymore, and to use iproute2 or ip instead(since brctl is deprecated presumably). Assuming this is good advice, how ...
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2answers
76 views

What reads /etc/iproute2/rt_tables

To do policy routeing, one needs to add a routing table to /etc/iproute2/rt_tables. I was wondering how this gets read. Is it read by the kernel, or is it read by the iproute2 userspace tools?
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1answer
80 views

Reset link counters

Preferably without bringing down the interface I'd like to reset interface link counters; bonus points if it can be done with iproute2 tools.
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1answer
34 views

How to get numerical output in `ip route` command

When using route command, -n switch does the trick. How to get numerical output using ip route command? It's man page does not mention anything similar. Specifically I need 0.0.0.0 instead of default.
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1answer
230 views

Persist ip route and ip rule configurations for Policy Based Routing (iproute2)

Currently running on Fedora Server 23, I've been searching for the right way to persist commands such as: ip route add default via 10.0.2.1 dev ens32 table EXAMPLE_TABLE ip rule add from 10.1.2.50 ...
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16 views

Do I get the exact same tcpdump output if I use bond or bridge?

I need to get the tcpdump output. I was unable to set up a bridge but I could set up a bond. Does it matter which one I use when looking at the output of a tcpdump?
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Bridging two interfaces with iproute2 doesn't work

I'm trying to create a bridge between eth0 and eth1 with iproute2, but there's always the error: RTNETLINK answers: Operation not supported when I use the command:ip link add name br0 type bridge. ...
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126 views

Not permitted to add eth0 to bond0

I'm trying to add an interface to my bond0 but I always get the error. sudo ip link set dev eth0 master bond0 RTNETLINK answers: Operation not permitted I already tried it with sudo and with ...
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372 views

ip link add gives me an error that it's not supported

I would like to set up a bridge with iproute2 like this: Adding bridge : ip link add name br0 type bridge Bringing bridge UP : ip link set dev br0 up Adding interface to bridge : ip link set dev eth1 ...
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1answer
78 views

Route Locally generated packets to different gateway [duplicate]

I need to send the packets of specific port to different gateway. This is the situation: The server has different services, like http, dns, and mail (smtp,pop,imap), and it has two gateways. eth2: ...
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2answers
138 views

Direct connection w/ ethernet cable

This is for "research" not pragmatic purposes -- I want to know how this is supposed to work, since my guess below does not. In other words, I do not want an answer that involves /etc/network/...
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1answer
65 views

routing table and (iproute2 vs net-tools)

I have the following routing table: # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.42.129 0.0.0.0 UG ...
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2answers
274 views

ip route save binary or ascii?

According to ip-route(8) : ip route save save routing table information to stdout This command behaves like ip route show except that the output is raw data ...
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0answers
38 views

How to route one IPv6 interface to another IPv6 interface

I am following an instruction from this link, it uses ethernet link and assigns bbbb::/64 address, and another interface (/dev/ttyACM0) that has aaaa::/64 address. It has the following network ...
3
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1answer
228 views

add route in Linux if sub-net, where gateway is situated, is not configured

I have a PC which has 192.168.1.1/24 configured to eth0 interface. Now if I try to add routes via 10.10.10.254, the ip utility reports that No such process: root@PC:~# ip neigh add 10.10.10.254 ...
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Forward public network around current network

For the purposes of this discussion, I have a very current always-on linux machine with two nics: wifi0 eth0 A very crude diagram of my desired configuration looks like this: ...
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1answer
94 views

What's ndisc_cache?

Suppose I want to use : $ ip ntable show dev eth0 inet arp_cache dev eth0 refcnt 4 reachable 20744 base_reachable 30000 retrans 1000 gc_stale 60000 delay_probe 5000 queue 31 ...
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2answers
34 views

How to use routing to use the next available inetface

My system has 2 interfaces (eth0, eth1). I open a socket and bind it with an ip attached to eth0, now I want the OS to route the packets to another ip (which attached to eth1 but i'm not sure it's ...
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2answers
146 views

traffic routing with DNS

I have 2 gateway machines. 1 debian (main - 192.168.1.1), 1 centos (backup 192.168.1.2). There are 2 networks, 1 LAN and 1 WAN, going through "main" and from there over ISP1 "backup" is on LAN and it ...
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1answer
42 views

redhat 9 persist default gateway

We changed the IP addresses of our RedHat 9 system that controls a conveyor/sorter system. When originally installed many years ago someone chose 192.0.0.10 as the IP! But for some reason it defaults ...
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1answer
84 views

“ip rule show” does not take any arguments

I'm trying to get the routing rules for a specific IP but the ip rule command throws an error. Shouldn't this work like the add/del etc. ? At least that seems to me from the docs. $ ip rule list 192....
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173 views

Why do I get “duplicate” local IP addresses on different interfaces?

I have two network interfaces(a wireless and an USB dongle) attached to an Ubuntu server and both get the same local IP address. Is there any reason for this or a way to force it assign distinct IP ...
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1answer
1k views

Help translating this `ip` command to `route` command in `post-up` hook

I am having trouble getting a static routing ip command to become permanent by way of the post-up hook in /etc/network/interfaces. Here are the relevant details: /etc/network/interfaces # The ...
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0answers
362 views

Running a systemd service file after the network is up to bypass an OpenVPN default gateway

I would like to add a static route using a systemd service file on system boot. I have a DMZ network on a separate 192.168 class C network reachable via my default gateway. I also use OpenVPN to ...
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2answers
820 views

How can I bring up up a non-boot (ONBOOT=no) network interface with iproute2?

Have a network interface that does not come up on boot-up: [belminf@tito ~]$ grep ONBOOT /etc/sysconfig/network-scripts/ifcfg-enp0s3 ONBOOT=no I know I could do the following for DHCP: [belminf@...
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195 views

How do you create an ip alias using iproute utils?

While reading the O'Reilley book on Apache Web Server, they gave an example on using ifconfig to set ip aliases on an interface: ifconfig ep0 192.168.123.2 ifconfig ep0 192.168.123.3 alias netmask ...
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1answer
189 views

I need dhclient to flush IP address/routes when link goes down

I am running one Ubuntu Server 14.04 with network configuration using /etc/network/interfaces and so ifup/ifdown scripts. I realised that if I configure one interface in DHCP mode, then I unplug the ...
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2answers
769 views

iproute2 command to enable a IPv4 address

I am investigating how to have iproute2 commands replace the old ifconfig and ifup ifdown command, and I found out something interesting. My NIC setup is: [16:07:41 root@vm network-scripts ]# cat /...
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Interface on Linux for IP range to divide incoming traffic

In order to divide incoming traffic I use the "ip link" command: ip link add link eno1 name eno1.vlan10 type vlan id 10 I want to do the same for a network range, so that I have a named interface ...
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113 views

delay in IP route deletion

(Apologies if this is the wrong StackExchange for this question, but there does seem to be some confusion regarding appropriate targeting of IP networking questions) I am very much a network newbie, ...
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657 views

default route of br0 gets dev eth0 instead of dev br0

On my LinuxMint laptop, i have a recurring problem with my bridge br0. On each start up, the default route does not work. The routing table uses eth0 instead of br0 probably because of dhcp. i roam ...
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1answer
69 views

Make a request through vpn interface

I want to be able to make request through a specific network interface, like this: ping -I eth0.1 google.be ping -I eth0.2 google.be This example works on my multihomed OpenWRT router. I now want ...
2
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1answer
299 views

Assymetric routing problems in LINUX

Assymetric routing problems are driving me crazy! I am trying to build a multi-homed server with 3 NICs. Each NIC is connected to 3 different subnets: eth0: LAN connected, 10.99.72.38; function: ...
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670 views

how to open up socks/SSH on different network interfaces?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...