Tagged Questions

0
votes
1answer
23 views

Does traffic policing reduce transmission speed or it reduces the speed of the interface in which it was configured?

I have a question about traffic policing and more specifically, related to traffic control (tc) in Linux. I'm not too familiar with networking, so please excuse my technical terms. I have configured ...
1
vote
2answers
60 views

Stuck TCP Connection in Linux

Strange problem. I have server "ALPHA" in Dallas and server "BETA" in Hong Kong, about 195ms ping times apart from each other. ALPHA is connected at 1gbps full, and BETA at 10mbps full. ...
0
votes
1answer
48 views

Specifying which network interface to use

Assuming multiple network interfaces (eth0, eth1...), how can I specify which one I would like to use?: Can I specify per-application which network interface should be used? Can I specify ...
-2
votes
0answers
26 views

Unable to ping outside of DHCP server on Suse Linux Enterprise [closed]

I'm quite new to linux so please bare with me. I have a network of 4 computers and a Suse Enterprise server. I configured the Suse box as a DHCP server. The DHCP server (192.168.1.1 on eth0) is ...
0
votes
1answer
28 views

Filtering input with iptables: -i <interface> versus -d <ip>

I'm changing my iptables setup to cope with the addition of a new uplink, which now receives its configuration through DHCP. I currently list my interface's IP addresses directly in my rules, which ...
1
vote
4answers
56 views

Is it possible to run two services on the same ports with different IP but on the same machine?

My question is simple. Is it possible to run TWO different game servers using exact same port but on different IP's using same network interface on the same server ? Does each IP adress have it's ...
0
votes
1answer
16 views

Create non-vlan interface with vlan-interface type name

I have 2 interfaces: bond0 and bond1. bond0 is connected to a trunking port, i.e. will be assigned vlans like bond0.10 bond1 is connected to a static port for vlan 20. So as far as connectivity goes, ...
0
votes
1answer
42 views

what is the --kerneltz in iptables command

I am using iptables for my project but facing some problem as follow. 1.in iptables 1.4.7 iptables -A INPUT -s 10.0.4.247 -m time --datestart 2013-5-16T12 --datestop 2013-5-16T16 -j DROP or ...
-3
votes
1answer
56 views

What are the drawback if I use 127.0.0.1 instead of 127.0.1.1 in my host file?

Ubuntu default host file is something like 127.0.0.1 localhost 127.0.1.1 myhostname Will there be any drawback if I change to: 127.0.0.1 localhost myhostname
0
votes
1answer
41 views

Tunnel Connections through NAT Firewall. [closed]

I am currently working on some design concepts that would see me have the requirements for the following type of system. In short I am looking at ways to Tunnel a connection through NAT similar to ...
-2
votes
2answers
50 views

Program using /etc/network/interfaces? [closed]

The file is configured for a static ip ethernet connection. I do not have isc-dhcp-client nor network-manager. So which is the program that actually uses /etc/network/interfaces to make the connection ...
1
vote
0answers
28 views

Receive errors counter in /proc/pid/net/dev

Can anyone explain what gets reported in /proc/pid/net/dev in the receive "errs" column: $ cat /proc/1372/net/dev Inter-| Receive | Transmit face ...
2
votes
2answers
34 views

Client DHCP on Linux seems to not be updating Windows AD DNS

I have an odd DNS issue that only sometimes presents itself. I have several Linux machines, running Ubuntu (10.10, 11.10, 12.04). Most of the time they work flawlessly. Sometimes, however, the ...
4
votes
1answer
69 views

Limit incoming and outgoing bandwidth and latency in linux

I realise many similar questions have already been asked, but so far I've yet to find a solution to my problem. I have a virtual linux server (running Debian Squeeze) that I use for testing of ...
0
votes
1answer
39 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 ...
0
votes
0answers
17 views

Samba WINS server with two networks

How can you confirm if SAMBA is really setup as a WINS server ? How can you tell SAMBA to have two differents WINS server. My debian server has two networks (eth1 (10.45.13.0), eth2 (10.45.15.0)). I ...
0
votes
0answers
38 views

How to redirect a local port range to a guest VM using Linux?

I am trying to redirect connections made inside a linux host to a guest VM, say 192.168.122.158, for a certain port range, say 8000:8500, i.e.: telnet localhost 8000 should actually result in a ...
1
vote
1answer
30 views

Bacula director daemon unable to authenticate windows 7 client

My director daemon in being hosted on an ubuntu machine and the client is a windows 7 machine. Both machines are on the same subnet. I'm having trouble authenticating between the server and the ...
0
votes
0answers
58 views

PRIO qdisc example not working

I have a TP-Link WR1043-ND with OpenWrt 12.09 (r36088, Linux 3.3.8). There is a bridge called br-lan joining eth0.1 (tagged VLAN for the 4 LAN ports) and wlan0 (Wi-Fi). There is also the WAN port at ...
-3
votes
2answers
82 views

how to intercept(not only capture) outgoing packets from TCP programs(or specifically TCP stack)? [closed]

I have a web server running on a host and I want to intercept all packets(including IP/TCP header) sent by the webserver, so the packets are not sent out to the Internet by the web server directly. ...
1
vote
1answer
70 views

TCP RWIN, MSS and MTU [closed]

I have been doing some reading into TCP Receive Window (RWIN), Maximum Segment Size (MSS) and Maximum Transmission Unit (MTU). Right off the bat I have some questions and I need a power user's help! ...
4
votes
2answers
191 views

LVS-TUN: ifconfig shows errors and collisions for tunl0 interface?

Check_MK has sent me an email as follows: ***** Nagios ***** Notification Type: PROBLEM Service: Interface 5 Host: foo Address: x.y.z.t State: CRITICAL Date/Time: Fri May 3 10:02:40 ICT 2013 ...
0
votes
1answer
45 views

debian clients connected to the same switch, ping problems

I have two machines that are connected to the same switch. Machines have multiple ethernet interfaces connected to the different networks. Computer A can ping an antenna which is connected to the same ...
0
votes
1answer
85 views

openvswitch: connecting two virtual private networks on two different machines with gre/ipsec

Here is the setup: We have a hardware (server) that presents a service to the customer (or "outside world", if you so will). Internally, the services and functions are distributed over several virtual ...
0
votes
0answers
10 views

ldirectord does not transfer connections when a real server dies

I am using ldirectord to load balance two IIS servers. The ldirectord.cg looks like this: autoreload = yes quiescent = yes checkinterval = 1 negotiatetimeout = 2 emailalertfreq = 60 emailalert = ...
0
votes
0answers
25 views

nis nfs configuration in linux client system

Server OS-redhat enterprise Linux 5 Client OS-fedora 17 server home directory doas not mount automatically at the boot time manual mounting working properly I done all the things below ...
0
votes
2answers
114 views

TCPDump and IPTables DROP by string

by using tcpdump -nlASX -s 0 -vvv port 80 I get something like: 14:58:55.121160 IP (tos 0x0, ttl 64, id 49764, offset 0, flags [DF], proto TCP (6), length 1480) 206.72.206.58.http > ...
-1
votes
0answers
17 views

Routing issue from virtual machine in weird network situation [migrated]

I have a a bit complicated network topology I have a router from my ISP with the network 100.0.0.0/24, the router's IP is 100.0.0.1 My own Linksys router has 100.0.0.2 plus 192.168.1.1 for my LAN I ...
0
votes
1answer
31 views

networking between two internal server

I am facing a problem that I have an static IP without domain name. I have two servers running having Local IP as 192.168.1.101, 192.168.1.102. there is a link on the index page in 1st server which ...
0
votes
0answers
30 views

Strange Keepalived VRRP email notification

I have a 3 nodes keepalived (K1 to K3) installed and receiving email notification. The setup of keepalived is K1 VI_50, priority 100 VI_51, priority 98 VI_52, priority 99 K2 VI_50, priority 99 ...
0
votes
0answers
17 views

Where can I obtain libnet.so's source code? [migrated]

libnet.so is the system library that Java (linux distro) uses for all its native networking calls. I'm trying to debug a complicated networking issue involving a Java app, and need to take a peek at ...
2
votes
2answers
56 views

Can I use IPs assigned to virtual network interfaces in a bash script?

I'm wondering if it's possible to dynamically read in the IP addresses of network interfaces for use in a bash script. Something like: #!/bin/bash MYPUBLICIP= get_eth0_address MYPRIVATEIP= ...
4
votes
1answer
96 views

Linux networking port exhaustion

I've done as much research as I could on this without digging right off in the kernel source. There seems to be a large amount of disinformation/incorrect info on the subject, so I hope this answers ...
0
votes
1answer
91 views

Virtual network for reproducible tests

Im developing a software product that uses networking features like device bonding an multi-homing protocols. As with any protocol development, test-code needs to take latency, package-dropping etc. ...
-1
votes
0answers
20 views

Sever networking stops after few hours but works after suspend/wakeup [migrated]

I have an Ubuntu 12.10 Desktop PC acting as my headless home server. I can ping it and access the files and folders on the computer with no issues. But after a few hours of running, its networking ...
0
votes
1answer
39 views

how to check which CPU cores are serving rx queues for a particular NIC and if RPS is enabled

On my host (RHEL 6.3, 2.6.x kernel) , eth2 generates irq # 60-65. I validated it via /proc/interrupts. The /proc/irq/61-65/smp_affinity shows following bitsets for 5 queues 1000 0040 0400 0100 0010 ...
1
vote
1answer
17 views

If I have a process which is supposed to be receiving data from multicast, how can I check if it actually is?

I can check gstack, but just because I see the listener threads on the recv call does not mean that call is not returning. One other thing I thought was to do something like: netstat -lupe | grep ...
1
vote
2answers
60 views

Disable IP on bridge

OK, I'm running libvirt on my server, I've only one interface, in order to use public IP in my VM I need to setup a bridge, everything OK so far.. But I don't want to setup a IP address at bridge ...
0
votes
1answer
44 views

Is it worth to set up a different network interface for connections to MySQL?

I have a high load website served by two servers: web server with nginx and php, and database server with mysql. Web server serves all the static content and connects to MySQL and outside world ...
2
votes
1answer
64 views

Linux machine does not answer an ARP request

We have this situation: A router, which is an Ubuntu VM, has multiple VLAN interfaces on the same physical NIC. Those VLAN interfaces are dynamically configured and torn down and attached to networks ...
1
vote
4answers
309 views

DNS lookup failed — dig: couldn't get address for 'ns1.p34.dynect.net': failure

I am a Network Admin from India, managing a large University Network of more than 15000 users. Here goes my problem - > My DNS is unable to get ip address for ns1.p34.dynect.net. when i use dig ...
0
votes
1answer
66 views

Source policy routing breaks layer 2 domain routing

I have a Linux (Ubuntu 12.04) machine (c220-1) that has multiple interfaces. The two of interest here are: eth2: 10.10.0.131/24 eth3: 10.20.0.2/24 The default route is set to 10.20.0.2. However, ...
0
votes
0answers
39 views

Need to programmatically cycle openvpn

I'm running openvpn client 2.2.0 on ubuntu 11.10 and I need a way to programmatically restart the process. I have a script that starts up openvpn fine the first time, but then on subsequent restarts ...
-2
votes
1answer
32 views

Connecting a usb external drive in NFS to a different server [closed]

I have two unix CentOS servers in the same farm. One of them has an usb HD connected. I would like to access the same usb HD from the second server (I want to be able to write directly to that HD). ...
0
votes
1answer
59 views

How to check if sockets are sending/receiving data on linux?

I often have to debug processes which involve a server client tcp connection. I'd like to check, during times where a client might seem stuck, whether the server is sending it data or not. I can use: ...
-1
votes
1answer
40 views

Debian bridged wifi connection doesn't start with system [closed]

I have t debian pc which is used as router. I'm using hostapd for creating wireless acess point, and i've bridged ethernet and wifi using brige-utils. My /etc/network/interfaces auto lo iface lo ...
-2
votes
2answers
83 views

Using tcpdump to find strings [closed]

I need to block certain TCP packets by trying to find a string match in and on them. Is there a way to do that with TCPDump? Or do I need wireshare install on my linux server? One I have the string ...
0
votes
0answers
69 views

Nginx - Getting high request time for some static files

We recently moved to Nginx for serving static images for our website. The entry level server is easily able to handle the load with load avg mostly around 0 and low cpu usage. But when we logged ...
-1
votes
1answer
48 views

How to check for GRE Tunnels [closed]

Is there a way to check for GRE Tunnels? I've heard spammers will use GRE tunnels to send mail from a central machine out of another and would like to check for possible GRE tunnels.
0
votes
2answers
33 views

Can IP Address be assigned to NIC connected with cross over cable

My main aim is to run client server applications written for TCP on linux (RHEL 6.3, 2.6.x kernel) hosts with dual NIC. One of the NIC is assigned IP Address so that i can ssh into it and the second ...

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