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Managing and using network connectivity on a unix system

1
vote
Assuming this is a physical host and not a virtual machine... Check your switch port packet counts. When a packet is sent to the host the counter should increment. At the same time use tcpdump on the …
answered Feb 19 '11 by bahamat
4
votes
Use anacron, because you won't be up 24/7, then add some magic to ensure the network is up (by pinging the default gateway), and if not delay the execution. Here's an example script that will get you …
answered Sep 26 '12 by bahamat
2
votes
Do you have a valid network link? Can you reach other websites? Is there a firewall? Can you resolve hostnames, in particular that one?
answered Jan 17 '11 by bahamat
0
votes
Those are fairly specific requirements. You're not going to find any guides for setting up your exact requirements. What you need to do is break down your requirements and figure out which applicatio …
answered Oct 18 '12 by bahamat
9
votes
The reason you're not seeing them is because you're on a switched network. Your network switch only forwards packets to interfaces to which they are destined. This is determined by the link-layer addr …
answered Aug 7 '11 by bahamat
1
vote
That works well enough for now, for Linux. On other UNIX systems (the ones I have my hands on are Mac OS X and Solaris) the port is separated by . instead of :. And this will most likely fail for a …
answered Sep 19 '11 by bahamat
0
votes
The syntax you're looking for is: ip tunnel add <name> mode <mode> ... E.g.: ip tunnel add gre0 mode gre ... The name is an arbitrary text string, it can be anything you want. I usually name the …
answered Jan 2 '14 by bahamat
1
vote
That's one of the subtleties with using a flow based packet filter. If you use target -j REJECT then a RST packet will be sent back, terminating the connection.
answered Jul 28 '13 by bahamat
1
vote
far as the networking stack is concerned, above layer 1 a VLAN interface might as well be a physical interface so you need to treat it as such. If you want an additional IP with an overlapping subnet …
answered Jul 23 '13 by bahamat
16
votes
How? Or TL;DR The fastest method I've found is a combination of tar, mbuffer and ssh. E.g.: tar zcf - bigfile.m4p | mbuffer -s 1K -m 512 | ssh otherhost "tar zxf -" Using this I've achieved susta …
answered Sep 19 '12 by bahamat
2
votes
If I understand correctly, you want an OpenVPN tunnel and a PPTP tunnel, each that will route tunneled traffic out eth0, but each with it's own IP. If I'm wrong in that, try to clarify and I'll do wh …
answered Apr 7 '13 by bahamat
10
votes
It's not just you. See here: http://www.dd-wrt.com/wiki/index.php/Wireless_Bridge#Limitations Basically, the spec for WiFi says that any wireless adapter can only have one MAC address, which makes b …
answered Jul 18 '11 by bahamat
1
vote
That happens because you have net.ipv6.conf.*.use_tempaddr set to 1. This enables RFC 4941 privacy addresses for the specified interface(s). RFC 4941 states that implementations MAY remove deprecated …
answered Jan 28 '15 by bahamat
0
votes
It sounds like you've already got most of what you need, but you're missing some magic. First of all, to handle multiple VIP addresses you want to use VRRP (or possibly anycast, but I don't think tha …
answered Jun 26 '13 by bahamat
5
votes
If you have a copy of the key you can use ssldump which uses a syntax almost identical to tcpdump. It won't be quite as pretty as tcpflow, but you can get at the encrypted content.
answered Nov 22 '12 by bahamat

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