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05-13-2015, 11:15 AM
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#1
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Senior Member
Registered: Apr 2003
Location: Germany
Distribution: openSuSE Tumbleweed-KDE, Mint 21, MX-21, Manjaro
Posts: 4,640
Rep: 
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How to connect a netbook via cable via PC via UMTS-stick to the internet
Silly question for old hands in networking, I know. I'm new, though. So, this is the setup: - netbook with openSUSE 13.2 / KDE and networkmanager
- connection with ethernet cable to
- PC with openSUSE 13.2 / KDE and networkmanager
- UMTS-stick in a port of the PC
- internet
I want to browse the internet on the netbook utilizing the UMTS-stick in the PC. I can now copy files / access data on both machines using dolphin and the sftp protocol, i.e. both machines have a private IP-address and "know" the other one (as far as it goes).
What do I have to do to access the internet from the netbook? That is, how to make the PC pass the packets to the stick and lastly the net? Would the PC act as a router / gateway? What input needs networkmanager? Any tips, hints, pointers or links will be highly appreciated  .
Last edited by JZL240I-U; 05-13-2015 at 11:16 AM.
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05-14-2015, 02:43 AM
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#2
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Member
Registered: Jul 2005
Distribution: Mint 14 64bit
Posts: 71
Rep: 
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I think the PC should act as gateway that means you need to set its IP as the gateway address on the notebook.
Another step should be to create a couple of rules on the PC firewall to allow traffic from/to the notebook, if you use a firewall on the pc of course.
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05-14-2015, 08:28 PM
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#3
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LQ Guru
Registered: Jan 2006
Location: Virginia, USA
Distribution: Slackware, Ubuntu MATE, Mageia, and whatever VMs I happen to be playing with
Posts: 19,987
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This article from the Arch wiki might be helpful: https://wiki.archlinux.org/index.php/Router |
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05-16-2015, 12:03 PM
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#5
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Senior Member
Registered: Apr 2003
Location: Germany
Distribution: openSuSE Tumbleweed-KDE, Mint 21, MX-21, Manjaro
Posts: 4,640
Original Poster
Rep:
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Thanks to both of you, I'll see what I can achieve with your pointers. Internet connectivity is abysmal right now, sorry when I report only sporadically, I'll be back with results when and as soon as I can.
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05-28-2015, 11:26 AM
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#6
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Senior Member
Registered: Apr 2003
Location: Germany
Distribution: openSuSE Tumbleweed-KDE, Mint 21, MX-21, Manjaro
Posts: 4,640
Original Poster
Rep:
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I used the link sam.pedraglio provided, since my setup is like this:
Code:
netbook <-> cable <-> PC <-> mobile-internet (UMTS-stick)
These were the commands I used (as advised in the Arch-Wiki):
Code:
root@PC # ip link set up dev enp3s0
root@PC # ip addr add 192.168.2.100/24 dev enp3s0
root@PC # sysctl -a |grep forward
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.default.forwarding = 0
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.enp3s0.forwarding = 0
net.ipv4.conf.enp3s0.mc_forwarding = 0
net.ipv4.conf.lo.forwarding = 0
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.ppp0.forwarding = 0
net.ipv4.conf.ppp0.mc_forwarding = 0
net.ipv4.ip_forward = 0
net.ipv4.ip_forward_use_pmtu = 0
net.ipv6.conf.all.forwarding = 0
net.ipv6.conf.default.forwarding = 0
net.ipv6.conf.enp3s0.forwarding = 0
net.ipv6.conf.lo.forwarding = 0
net.ipv6.conf.ppp0.forwarding = 0
root@PC # sysctl net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
root@PC # sysctl -a |grep forward
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.enp3s0.forwarding = 1
net.ipv4.conf.enp3s0.mc_forwarding = 0
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.ppp0.forwarding = 1
net.ipv4.conf.ppp0.mc_forwarding = 0
net.ipv4.ip_forward = 1
net.ipv4.ip_forward_use_pmtu = 0
net.ipv6.conf.all.forwarding = 0
net.ipv6.conf.default.forwarding = 0
net.ipv6.conf.enp3s0.forwarding = 0
net.ipv6.conf.lo.forwarding = 0
net.ipv6.conf.ppp0.forwarding = 0
root@PC # iptables -t nat -A POSTROUTING -o internet0 -j MASQUERADE
root@PC # iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
root@PC # iptables -A FORWARD -i enp3s0 -o ppp0 -j ACCEPT
root@PC # iptables -L
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate ESTABLISHED
ACCEPT icmp -- anywhere anywhere ctstate RELATED
input_ext all -- anywhere anywhere
LOG all -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-IN-ILL-TARGET "
DROP all -- anywhere anywhere
Chain FORWARD (policy DROP)
target prot opt source destination
LOG all -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-FWD-ILL-ROUTING "
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
Chain forward_ext (0 references)
target prot opt source destination
Chain input_ext (1 references)
target prot opt source destination
DROP all -- anywhere anywhere PKTTYPE = broadcast
ACCEPT icmp -- anywhere anywhere icmp source-quench
ACCEPT icmp -- anywhere anywhere icmp echo-request
LOG tcp -- anywhere anywhere limit: avg 3/min burst 5 tcp dpt:ssh flags:FIN,SYN,RST,ACK/SYN LOG level warning tcp-options ip-options prefix "SFW2-INext-ACC-TCP "
ACCEPT tcp -- anywhere anywhere tcp dpt:ssh
DROP all -- anywhere anywhere PKTTYPE = multicast
DROP all -- anywhere anywhere PKTTYPE = broadcast
LOG tcp -- anywhere anywhere limit: avg 3/min burst 5 tcp flags:FIN,SYN,RST,ACK/SYN LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
LOG icmp -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
LOG udp -- anywhere anywhere limit: avg 3/min burst 5 ctstate NEW LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
DROP all -- anywhere anywhere
Chain reject_func (0 references)
target prot opt source destination
REJECT tcp -- anywhere anywhere reject-with tcp-reset
REJECT udp -- anywhere anywhere reject-with icmp-port-unreachable
REJECT all -- anywhere anywhere reject-with icmp-proto-unreachable
Please note that the output of "iptables -L" doesn't show the three added lines?!? As far as I know this is the standard set up of openSUSE's firewall.
Lastly I added the ip on the client (netbook).
Code:
# ip addr add 192.168.2.101/24 dev enp6s0
# ip link set up dev enp6s0
# ip route add default via 192.168.123.100 dev enp3s0 # same address as in the beginning
and got: "RTNETLINK answers: Network is unreachable."
Umm. How to diagnose the problem? Is the NAT-ing problem resolved as I understand the linked bug report or have I omitted something here? Thanks for any pointers.
P.S.: I created also /etc/sysctl.d/30-ipforward.conf as required for a reboot.
Last edited by JZL240I-U; 05-28-2015 at 11:28 AM.
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06-02-2015, 05:34 PM
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#7
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Member
Registered: Feb 2012
Location: Germany
Distribution: siduction
Posts: 134
Rep:
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Silly remark here: You did make sure the "ethernet cable" is a cross cable, right?
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06-03-2015, 02:59 AM
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#8
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Senior Member
Registered: Apr 2003
Location: Germany
Distribution: openSuSE Tumbleweed-KDE, Mint 21, MX-21, Manjaro
Posts: 4,640
Original Poster
Rep:
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No, I didn't. I know it works because I use it for file transfers between the machines, see also http://www.linuxquestions.org/questi...el-4175541126/.
As far as I know modern hardware for ethernet detects the type of cable and uses their protocols accordingly so cross cables are not anymore necessary. |
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06-03-2015, 06:58 AM
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#9
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Moderator
Registered: Aug 2002
Posts: 26,864
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Looks like you did not change the example commands in the guide to match your network configuration. Your basic networking is already configured so just need to add the NAT rules on the PC and add DNS server to the netbook's resolv.conf file.
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -I POSTROUTING -o ppp0 -j MASQUERADE
The netbook
ip route del default
ip route add default via 192.168.2.100
Add nameserver 8.8.8.8 to /etc/resolv.conf
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06-03-2015, 11:45 AM
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#10
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Senior Member
Registered: Apr 2003
Location: Germany
Distribution: openSuSE Tumbleweed-KDE, Mint 21, MX-21, Manjaro
Posts: 4,640
Original Poster
Rep:
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Okay, I gave the iptables commands on the PC. Again, no trace in "iptables -L":
Code:
iptables -L
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate ESTABLISHED
ACCEPT icmp -- anywhere anywhere ctstate RELATED
input_ext all -- anywhere anywhere
LOG all -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-IN-ILL-TARGET "
DROP all -- anywhere anywhere
Chain FORWARD (policy DROP)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
LOG all -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-FWD-ILL-ROUTING "
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
Chain forward_ext (0 references)
target prot opt source destination
Chain input_ext (1 references)
target prot opt source destination
DROP all -- anywhere anywhere PKTTYPE = broadcast
ACCEPT icmp -- anywhere anywhere icmp source-quench
ACCEPT icmp -- anywhere anywhere icmp echo-request
LOG tcp -- anywhere anywhere limit: avg 3/min burst 5 tcp dpt:ssh flags:FIN,SYN,RST,ACK/SYN LOG level warning tcp-options ip-options prefix "SFW2-INext-ACC-TCP "
ACCEPT tcp -- anywhere anywhere tcp dpt:ssh
DROP all -- anywhere anywhere PKTTYPE = multicast
DROP all -- anywhere anywhere PKTTYPE = broadcast
LOG tcp -- anywhere anywhere limit: avg 3/min burst 5 tcp flags:FIN,SYN,RST,ACK/SYN LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
LOG icmp -- anywhere anywhere limit: avg 3/min burst 5 LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
LOG udp -- anywhere anywhere limit: avg 3/min burst 5 ctstate NEW LOG level warning tcp-options ip-options prefix "SFW2-INext-DROP-DEFLT "
DROP all -- anywhere anywhere
Chain reject_func (0 references)
target prot opt source destination
REJECT tcp -- anywhere anywhere reject-with tcp-reset
REJECT udp -- anywhere anywhere reject-with icmp-port-unreachable
REJECT all -- anywhere anywhere reject-with icmp-proto-unreachable
And on the netbook after "ip route del default": "RTNETLINK answers: No such process" and after "ip route add default via 192.168.2.100": "RTNETLINK answers: Network is unreachable"
Two minutes before that I successfully copied a bunch of files from the PC to the netbook (using sftp protocol in dolphin)...
Last edited by JZL240I-U; 06-04-2015 at 01:10 AM.
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