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16 views

Which flags should I use for my “netstat” commands?

I would like to use two variants of the netstat command; one exclusively for IPv4 and the other exclusively for IPv6 traffic. In both cases I would only like to list the following information: ...
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0answers
10 views

IPvsadm, cannot get it to work at all

From my production server, I should make several connections (>50) to two different IP addresses. I am trying to load balance among these two IP addresses when making outbound connections so that the ...
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1answer
28 views

IPv4 broadcast routing in Linux

I have a server with three network interfaces- loopback interface lo and two physical network interfaces eth0 and eth1: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN ...
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0answers
32 views

How does s_client turn ip6-localhost into 127.0.0.1?

When I use openssl s_client and ask it to connect to ip6-localhost it actually connects to 127.0.0.1 instead of ::1. This is what I see on both Ubuntu and Debian: $ strace -e connect openssl ...
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1answer
72 views

IPv4 goes offline several times per hour on headless remote server, IPv6 unaffected

On my Ubuntu 14.04.2 server IPv4 goes offline several times per hour (one to four times I've seen, but at no particular minute per hour or so). My hoster insists that the problem is on the ...
1
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1answer
342 views

Installing vsftpd - 500 OOPS: could not bind listening IPv4 socket?

I have to set up a FTP server on my machine. I have installed vsftpd using the command: sudo apt-get install vsftpd I then edited the configuration file vsftpd.conf in the location /etc. The file ...
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0answers
53 views

Flow of ipv4 over ipv6 tunnel

Re-posting my question from stackoverflow I am trying to achieve flow of ipv4 packets over ipv6 tunnel between 2 machines. Initially i had the following setup Linux1 eth0 ...
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2answers
87 views

Can I prevent a default route being added when bringing up an interface?

I have a system with two NICs on it. This machine, and a few accompanying devices will be moved and attached to different LANs or sometimes it'll be using dial-up. eth0: - 10.x.x.x address space - ...
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0answers
19 views

OpenSSH: UseDNS is not enforced

I cannot get the UseDNS constraint to work. It is set to UseDNS=yes on the server running sshd. That server queries a local DNS server which is the authority for each host on the network. Each host ...
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0answers
136 views

Arch Linux sudden wifi disconnects and unable to reconnect

I have a problem with my wifi internet connection that is secured by WPA. I have moved to a new location. I had set up a working internect connection but lost the connection after about an hour and ...
0
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0answers
161 views

Iptables and Ip6tables redirect traffic

I want to deny all the network traffic and just allow a few ports and redirect them through tor or the socket I have set in /etc/tor/torrc, where tor binds to. And I am currently setting up these ...
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2answers
2k views

netstat — why are IPv4 daemons listening to ports listed only in -A inet6?

I have a computer with: Linux superhost 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux It runs Apache on port 80 on all interfaces, and it does not show up in netstat -planA inet, ...
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3answers
4k views

Can TCP provide more than 65535 ports?

Is it possible to setup a Linux system so that it provides more than 65,535 ports? The intent would be to have more than 65k daemons listening on a given system. Clearly there are ports being used ...
1
vote
1answer
196 views

Define specific TTL for each interfaces

After some research, I was wondering if it was possible to define a TTL by interface as I can the Hop Limit definition in ipv6. To change the TTL in IPv4, I can change the file ...
2
votes
0answers
74 views

Allow internet access to public subnet

I'm running ESXi and received a public subnet from Hertzner.de . I've setup everything by using a 'router'-vm and different client-vm's. These client VM's can access the internet through the router-vm ...
0
votes
1answer
78 views

What is the pathname (the directory and file name) of the configuration file used for the DHCP client (not the server!)

(This question refers to the IPv4 client, not the IPv6 client.) (Hint: configuration files are kept under the directory /etc.) It is for a school assignment. I have to use man pages to find it. I ...
4
votes
1answer
1k views

Fedora 18 guest in VirtualBox 4.2: How to assign static IPv4 address to guest regardless of active ethernet interface on host

I have a Ubuntu 13.04 host running VirtualBox 4.2.12. This host has both a wired and a wireless network interface, but only one of which would usually be active at any given time. For example, at home ...
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2answers
6k views

SSH login via IPv6 successfull while using IPv4 to the same host yields “Permission denied”

I'm currently stumped by a strange problem… I have a dual stack host to which I want to SSH. If I connect via IPv6 everything works like expected datenwolf@foo ~/ > ssh -6 bar.example.com ...
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vote
1answer
2k views

How can I disable IPv6 in custom built embedded setup

I have an embedded system built using buildroot. I have had a number of network issues, one of which is that my machine cannot see its gateway despite it being on the same subnet. I have tried using ...
1
vote
1answer
379 views

Add ipv4 support to CentOS 6.3

I've installed two identical versions of CentOS using VirtualBox. The first instance works fine and has ipv4 configuration automatically working, but the second instance doesn't; it only comes with ...
7
votes
1answer
455 views

Detect other machine's address in link local?

I have two machines connected in link local IPv4 over a CAT6 cable. Is there a way from host1 that I can determine host2's IPv4 address? I'm on an Debian-derivative running kernel 3.2.0-34-generic.
2
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2answers
483 views

How to configure dhcpd to register ipv4 with bind while having static ipv6 addresses?

I have IPv6 configured on my local network via radvd; it advertises a routable IPv6 block, that all the machines auto-configure.s I have IPv4 assigned to a NAT'd block via dhcpd and that updates ...
1
vote
0answers
297 views

openBSD static ip can't connect

I have set /etc/hostname.msk0 to inet 192.168.1.102 255.255.255.0 NONE and /etc/mygate to 192.168.1.1 but still can't ping the router (192.168.1.1) do I need to configure dns to ping ? ...
6
votes
2answers
47k views

Static IPv4 & IPv6 configuration on CentOS 6.2

I try to configure static IPv4 & IPv6 configuration on CentOS 6.2. The configuration below works perfectly : # ifconfig eth0 x.x.x.x/29 # route add defalt gw x.x.x.y # ip addr add dev eth0 ...
2
votes
2answers
231 views

IPv6 NDP timer problem

Need to change Fedora Linux's IPv6 stack for NDP DAD timer changes. How to locate the Fedora's IPv6 and IPv4 stack in Fedora distribution dvd/site so that, we can recompile and generate new stack ?
4
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2answers
14k views

Two interfaces, two addresses, two gateways?

I have a system that has two network interfaces with different IP adresses, both of which are in the public address range (albeit via NAT in the case of the first one) and both of which have different ...