The linux tag has no wiki summary.
0
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0answers
12 views
Configure SNMP on local netowork - Linux Server [on hold]
I'm trying to relay information across snmp on an internal network. The localhost test works just fine, but I'm having trouble reaching the server from another machine on the same network.
$ snmpget ...
0
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0answers
9 views
Manually dialling a USB modem [migrated]
I have been trying to setup up a 4g usb modem with my raspberry pi running raspbian. The modem is recognized and I'm able to query imsi, signal strength and other details by running AT commands using ...
1
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0answers
13 views
What does * mean in linux for gateway ip? [migrated]
To be more precise, after running netstat -r , I got the following lines:
Destination Gateway Genmask Flags MSS Window irtt Iface
default 199.170.12.1 0.0.0.0 ...
0
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0answers
20 views
Connectivity problems with Azure Linux(Ubuntu VMs (HTTP, SSH) [closed]
Strange problem with Linux/Ubuntu virtual machines running in Azure North Europe data center. Virtual machines is running fine, when looked through Azure management portal. From there, everything ...
2
votes
1answer
119 views
overcome microbursts in cisco router or transmitting linux machine
I have linux machine multicasting UDP streams with Java applications. The multicats go though ciso router. I see lot of packet losses at receivers. Checking ports in routers reveals overruns counter ...
9
votes
2answers
344 views
ASICs vs x86 general-purpose routing/switching
SysAdmins often try to convince me that x86 general-purpose OS's can perform just as well as routers with low MHz CPUs and dedicated silicon (i.e., ASICs) at 1Gbps line rates. This thinking is ...
0
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0answers
42 views
dont fragment bit PING TOOL
Actually my machine wwan0 MTU is 1500
ashokkrishna@ashokkrishna-Lenovo-B560:~$ ping -s 1490 example.com
PING example.com (93.184.216.119) 1490(1518) bytes of data.
1498 bytes from 93.184.216.119: ...
3
votes
1answer
235 views
Interpreting TTL in ping results
I work for a VoIP service provider and I am working an issue with a customer who has a cable internet connection that's throwing me for a loop.
He has a single block, which we'll pretend is ...
0
votes
1answer
80 views
How do I connect to an HP 1910 switch console from GNU screen?
I'm trying to use GNU screen on Ubuntu 14.04 to connect to an HP 1910-8G switch console but it is not working. So far for all of my attempts, screen seems to terminate or just appears blank. Has ...
1
vote
1answer
155 views
Resolve overlapping subnet problem using Linux and IPTABLES!
I have a dilemma; I have a customer with an application server running on CentOS 5 (latest). The app server is configured with 2 interfaces:
eth0 - connect to the client network with subnet ...
0
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0answers
59 views
IPv6 Ping Failing because of missing NDP packets
I'm getting very strange IPv6 behaviour on my network. If I try to ping "he.net" or any other public IPv6 site from my laptop, it fails. In fact, if I ping my router (openwrt) directly, it fails.
I ...
0
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0answers
124 views
Depoly AnyCast Dns inside private network
We need to enable anyCast DNS inside our ISP network. What we need is, any request for domain files.com from our local ISP(Asia) users( including tiers) should route towards the DNS located in the ...
1
vote
2answers
403 views
Difference between sniffer tools
I am unsure what the following networking tools do. They all seem to do a similar thing.
First some background. I am familiar with cisco IOS. I am doing some linux networking experimentation with ...
2
votes
1answer
141 views
Redirect BGP routes into the file with quagga
We've deployed the caching server in local ISP and peered it with the ISP router via BGP protocol in order to get all advertised ip prefixes of ISP. We need to redirect all of these ip prefixes into a ...
5
votes
2answers
213 views
How do I mcast multiple pcap files simultaneously with guaranteed ordering and controllable speed?
We capture many pcap files every day on many different multicast groups. For the purposes of testing & benchmarking, we wish to replay these files in an isolated environment and in a controlled ...
1
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0answers
82 views
On a dual-homed Linux machine, why do packets route correctly without a link scope entry in one table, whereas the other table requires it? [closed]
I have a Linux (3.2.0-35) box with two network interfaces, bond0 on 192.168.20.0/24 and bond1 on 10.1.3.0/24. Here are what I believe to be the relevant routing tables and rules:
$ ip rule
0: from ...
1
vote
0answers
163 views
BGP feeds from ISP?
We've deployed the caching server on our Local ISP. The caching method is, any request coming from our local ISP clients should be directed to the local Caching server and rest should be forwarded to ...
1
vote
0answers
399 views
OpenSWAN IPSec Connection to Cisco Meraki MX appliance
I have service I need to make VPN connections to.
I have this working perfectly fine in windows, setup was quick, easy and straightforward.
I am now trying to achieve the same connection in Linux ...
1
vote
1answer
139 views
Zeroconfig with multiple interfaces
I have some questions. First off my understanding on networks is minimal.
I'm trying to understand how zeroconfig works in a situation where not all devices are on a single network, but they are all ...
0
votes
0answers
75 views
VPNC cisco + quick mode response rejected error
I installed a vpnc on my Linux red-hat machine version 6.3
Most of the cases vpnc work well ( connecting to gateway customers by vpnc )
But against some particular customers ( Cisco gateways ) , ...
3
votes
1answer
469 views
TCP connection stalling
With these two captures in mind (both illustrating the problem) we are experiencing a problem with TCP flow when we have some specific packet loss.
https://www.cloudshark.org/captures/a1a050d95269 ...
3
votes
1answer
395 views
Decoding packets in an OpenFlow ryu switch
I'm trying to examine a simple OpenFlow ryu switch, and get out of it the destination and source addresses.
I'm using Mininet.
For example for the next commands:
h1 python -m SimpleHTTPServer 80 ...
3
votes
0answers
539 views
packet loss. (MAC addresses, bonds and VLANs)
The problem
I have packet loss (from 25% to 75%) on the network after a week
since every switch reboot.
When I reboot the switch the packet loss
disappears.
The packet loss is not detected in ...
0
votes
0answers
125 views
Routing traffic to some host in Internet via VPN server (tcpdump OK, but no traffic) [closed]
I need route traffic to some host in Internet via VPN server.
Configuration:
Computer:
ubuntu-12.04
eth0 - x.x.x.x/24
tun0 - inet addr:10.8.0.6 P-t-P:10.8.0.5 Mask:255.255.255.255
There is ...
2
votes
1answer
1k views
Static routes between 3 windows routers and vyatta
Hi for a school project I have to build a network this is the current situation:
I can ping between 172.16.0.0/19, 172.16.32.0/19 and 172.16.64.0/19. I can ping from my router (172.16.128.15) to ...
4
votes
1answer
2k views
What is the difference between DD-WRT regulatory domains? [closed]
DD-WRT offers two different "Regulatory Domain",
United States
United States (Public Safety)
Reading the source, I see,
{CTRY_UNITED_STATES, FCC1_FCCA, YES, YES, YES, YES, YES, YES, YES, ...
-1
votes
1answer
186 views
Static routing in Linux
I want to know how static routes are evaluated in Linux. Have a few more specific questions.
How are the metrics used?
If the packet is at the last hop what do I put in the next hop field of the ...
4
votes
2answers
1k views
riverbed wan optimizer does not receive traffic
I have 2 Riverbed WAN optimizers and a WAN simulator. I connected 2 WAN ports of the 2 Riverbeds to the WAN simulator, connected 2 LAN ports along with 2 servers on a switch, and configured 2 subnets ...
7
votes
3answers
827 views
Why does my UDP Broadcast wireless communication is capped at 1MBs?
I am trying to implement Network Coding over a meshed network. Therefore I need to send packets to several destinations, this is way I am using Broadcast packets. But I can not understand why this is ...
