All Questions
Tagged with networking iptables
960
questions
1
vote
2
answers
14k
views
need to route the traffic through a specific network card
I have two network cards and they both have a different network. I need the outgoing connections to go only through a specific network card. Any help ?
Update:
I ran a route -n command and got this ...
- 116
2
votes
1
answer
440
views
DD-WRT: keep source IP after port forwarding
I just started using DD-WRT on my WNDR3700, but now all my incoming connections to a server inside the network get the same source IP as the router.
How can I change this back so I get the real ...
- 121
8
votes
1
answer
10k
views
Will increasing number of rules in iptables slow down my internet
How much impact will the rules have on speed, if we are using match to queue the packets.
- 471
1
vote
1
answer
1k
views
internet connection gone after $ iptables -F INPUT
I have a PC with two Ethernet cards, and I was trying to configure my eth1, but when I typed $ iptables -F INPUT, the internet was gone on eth0. Does anyone has any idea how to get my internet ...
- 13
3
votes
1
answer
5k
views
Match multiple strings in iptables
I have 2 strings, and i wish to queue the packet if it contains both the strings ( something like ("jsh"&&"gjhyg")), i tried following ways, but they don't seem to work:
sudo iptables -A ...
- 471
1
vote
0
answers
171
views
How to redirect local connection to my things in IPv6 on linux?
With IPv4 I can make some program connect to my service instead of where it wants using REDIRECT and DNAT targets in OUTPUT chain in iptables (sometimes combined with -m owner)
In IPv6 hovewer I don'...
- 17.3k
0
votes
1
answer
280
views
Is it possible to figure out which http request generated the corresponding response
I am using iptables to listen to tcp (http) packets. I am filtering out INPUT responses containing a matching string. Is it possible to know which http request generated the response. Assuming 10 ...
- 471
1
vote
1
answer
174
views
Separating two networks
I have two routers, R1 and R2.
R1 (a stock linksys router running dd-wrt) is connected to internet and is serving internet to a network of 5 devices/PCs running a DHCP server, with a network of 192....
- 13
2
votes
1
answer
2k
views
Gateway on a virtual network interface used by LXC guests
I'm currently having some problems with configuring a gateway for a virtual network interface.
Here is what I've done :
I created a virtual network interface :
# brctl addbr lxc0
# brctl setfd lxc0 ...
- 163
3
votes
1
answer
2k
views
Use port forwarding with masquerade
I'm using a debian as a router with nat configured. How can I set up port forwarding, to set an rdp server on the local network for example?
- 147
2
votes
2
answers
1k
views
Iptables port mapping from two PCs to one
We have 3 PCs, two of it are connected to internet (both of it have 2 NIC)
PC1:
eth0 - 1.0.0.1 (external IP)
eth1 - 172.16.0.1 (internal IP)
PC2:
eth0 - 1.0.0.2 (external IP)
eth1 - 172.16.0.2 (...
- 33
0
votes
1
answer
115
views
NATing with a single-homed machine possible?
I have the following setup:
a) a single-homed machine, A, that can see the Internet.
b) other machines B, C, and D that cannot see the Internet.
c) A, B, C, and D can see each other.
d) all ...
- 851
0
votes
2
answers
994
views
How to setup IPtables to allow capture network traffic from a virtualbox VM configured with NAT
I would like to have a VirtualBox virtual machine that can't get online. I want to be able to monitor all network traffic attempts from the Linux host.
So, if the virtual machine attempts to make a ...
1
vote
1
answer
6k
views
linux drops packet when trying to route it - why?
I track packets using LOG targets for all chains of all tables and the last chain I see my packet in is the PREROUTING chain of the mangle table:
mangle_PREROUTING: IN=eth0 OUT= MAC=00:16:3e:0f:01:00:...
- 111
43
votes
1
answer
35k
views
iptables vs route
What's the difference between these two tools?
Can anybody tell me what the main workflow of networking behind Linux (in relation to IPv4 packet filtering, NAT and IP routing table) is?
- 1,290