Linux Networking

Question by

gudii9

2017-09-08

site booksmarks to shared bookmarks in winscp

Hi,
how to transfer
site booksmarks to shared bookmarks in winscp

please advise

0 Comments

Question by

dtobal

2017-08-31Solved

CentOS Vlan untagged and tagged

Hi friends!
I am newbie about to vlan. I have a CentOS with an IP 192.168.1.10 on eth0. Our Network Administrator has added switches and devices with VLAN 10.

I need to keep my IP on eth0 (untagged) and allow these devices on VLAN 10 to talk to my server. If I create eth0.10 with the IP configuration... Can I use the same IP of eth0? WIll Linux allow the same IP on two interfaces?

Thanks
Denilson

6 Comments

Hello ,

I have a problem with interfaces on a multihomed topology. My interfaces can not ping each other and can not ping theirselves too
sysctl as given below.

But it is able to ping the interface ip when i directly write ping 37.123.98.142 , if the both interface are not able to ping this interface's ip how does it ping it or from where ?

I have to let them have access each other how shoud i do it ?

Note: loopback interface activated
Note2: em interfaces are all down

[root@spd network-scripts]# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.conf.p1p1.rp_filter = 2
net.ipv4.conf.p1p2.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.lo.rp_filter = 2
net.ipv4.conf.p1p1.accept_local = 1
net.ipv4.conf.p1p2.accept_local = 1
net.ipv4.conf.all.accept_local = 1
net.ipv4.conf.default.accept_local = 1
net.ipv4.conf.lo.accept_local = 1
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.p1p2.arp_filter = 0
net.ipv4.conf.p1p1.arp_filter = 0
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.p1p1.arp_announce = 2
net.ipv4.conf.p1p2.arp_announce = 2

PING 37.123.98.142 (37.123.98.142) from 37.123.98.142 p1p1: 56(84) bytes of data.

^C
--- 37.123.98.142 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2055ms

[root@spd network-scripts]# ping -I p1p1 37.123.98.138
PING 37.123.98.138 (37.123.98.138) from 37.123.98.142 p1p1: 56(84) bytes of data.

^C
--- 37.123.98.138 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3064ms

[root@spd network-scripts]# ping -I p1p2 37.123.98.138
PING 37.123.98.138 (37.123.98.138) from 37.123.98.138 p1p2: 56(84) bytes of data.

^C
--- 37.123.98.138 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1038ms

[root@spd network-scripts]# ping -I p1p2 37.123.98.142
PING 37.123.98.142 (37.123.98.142) from 37.123.98.138 p1p2: 56(84) bytes of data.

^C
--- 37.123.98.142 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2060ms

[root@spd network-scripts]# ping 37.123.98.142
PING 37.123.98.142 (37.123.98.142) 56(84) bytes of data.
64 bytes from 37.123.98.142: icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from 37.123.98.142: icmp_seq=2 ttl=64 time=0.022 ms
64 bytes from 37.123.98.142: icmp_seq=3 ttl=64 time=0.017 ms
64 bytes from 37.123.98.142: icmp_seq=4 ttl=64 time=0.015 ms

…

Question by

gudii9

2017-08-30Solved

what is root in unix or linux world

what is meaning of root.
why i have to go to root. what i can do from root what i cannot do from root. what i can do using my user.
how unix allows logging in as different user say John when i logged in as say xyz

any online link or free video tutorials explaining all these concepts? an how to practice please advise

15 Comments

Hello ,

We have suprised on one test. We realize that when an ip address directly sends 1million pps to a server. That server normally working with irq perfectly , it hits to only one core of the server.
Why that happens and how this issue should be over comed.

10 Comments

Question by

FireBall

2017-08-23Solved

what is this numbers in iptables

Hello ,

any body know what is the meaning of this numbers in iptables config file :

*raw
:PREROUTING ACCEPT [1318098:74794423]
:OUTPUT ACCEPT [2065:1143634]

Question by

FireBall

2017-08-23Solved

iptables forward conntrack

Hello ,

When we add this rules for forwarded traffic it is dropping all packets as they are invalid. There is no notrack rule on the server, why does it see the forwarded traffic as it is invalid ?

#-A FORWARD -p tcp -m conntrack --ctstate INVALID -j DROP
#-A FORWARD -p tcp ! --syn -m conntrack --ctstate NEW -j DROP

3 Comments

Question by

FireBall

2017-08-23Solved

Advanced DDOS question

Hello ,

We are facing with some kind of an attack as given below also i have attached the pcap file ,

important thing is that ;

IP addresses spoofed with our country's ISP ip addresses
TTL has been spoofed also and the TTL values are in the range of the ip address owners - you should find and edit the same ddos on github with name VSE
Data is a copy of real packet used on this protocol for counter strike
Destination port is also counter's port
checksums are correctly generated

how should i block this kind of attack without blocking the real users ?

Protokol :17  Source IP :85.104.15.177  Source Port :58061  Destination IP :213.238.166.2  Destination Port :27015  TTL :108  Paket Boyutu :51  Checksum :9777  Data :FFFFFFFF71636F6E6E6563743078304135423333304500  
Protokol :17  Source IP :95.13.27.190  Source Port :55271  Destination IP :213.238.166.2  Destination Port :27015  TTL :111  Paket Boyutu :51  Checksum :64648  Data :FFFFFFFF71636F6E6E6563743078303044414236313000  
Protokol :17  Source IP :88.238.142.125  Source Port :55150  Destination IP :213.238.166.2  Destination Port :27015  TTL :105  Paket Boyutu :51  Checksum :37970  Data :FFFFFFFF71636F6E6E6563743078304138383935423800  
Protokol :17  Source IP :85.103.139.224  Source Port :52054  Destination IP :213.238.166.2  Destination Port :27015  TTL :108  Paket Boyutu :51  Checksum :49529  Data

…

9 Comments

Question by

FireBall

2017-08-23

Drop Bogus packets

Hello ,

Is there any possible way to drop bogus packets as seem below .

for this packets ; packet payload is smaller then the length of the packet

please replay answer ASAP

5 Comments

Have multiple VMworkstation VM's one of which I need to connect an Android device to. Need to setup DNS with pfSense or mint to control .local request. Need to be able to hit my.test.local which is one of my servers on my network 10.8.x.x. Everything reading is telling me how to make them see www.xxx.com. Need to stay local and resolve this address.

Hi,

I have user called xyz under that folder there is folder call test under that there is folder called abc, def, hij etc

i want to search to search in all above folders and subfolders for a particular keyword say " nullpointerexception " how t do that .
please advise

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Question by

gudii9

2017-08-17

winscp how to compare 2 different unix users

Hi,

winscp how to compare 2 different unix users say xyz and abc by opening xyz on left hands side and abc on right hand side. As of now on the left hands side i was able to open my windows laptop folder structure like C drive etc and on right hands side i am able to open one unix user like abc or xyz etc. please advise

5 Comments

Question by

gudii9

2017-08-15

unix xyz user size and cleanup

hi

on the unix box various users like xyz, abc etc.

Looks like disk space is running out of server and i need to cleanup.

How to know how much user xyz occupying size and how much abc user is occupying size. please advise

31 Comments

In Windows there is a checkbox "Register this connection's addresses in DNS". See attached screenshot.
What is the equivalent in
- Ubuntu Workstation
- Raspian (Raspberry Pi Debian variant)

Thank you

12 Comments

Question by

gudii9

2017-08-10Solved

search on string at multiple levels deep down

I want to search on below error
java.io.FileNotFoundException:

I want to search on all the weblogic domian directory files and its sub directory files and sub sub directory files?
how to search all the way to great great grad child level?

please advise

3 Comments

LVL 1

Question by

Leigh Kalbli

2017-08-10Solved

busy Box remote access

I have a vanguard calamp cellular modem with serivce from verizon and a static WAN address. Attached to it is a controller board running Busy Box v1.22.1. I am having issues configuring port forwarding of the modem to connect to the busy box device over ssh so i can run diagnostics. does anyone have any experience with something like this?

5 Comments

Question by

mac_g

2017-08-08Solved

Linux : how make link between directorie

OS : Linux

Let us suppose - we have 2 directories,
path1 : /prod/dir01/dir02 path2: /dev/dir01/dir01

If I refer path1, that should automatically should take it to path2.
Can it is possible to make it work in Linux ?

please advise.