RPi connects to the network but cannot be ping'ed

[elektito]

I just got my RPi yesterday and have been trying to set it up without a monitor using SSH. My problem is that although I'm pretty sure that the raspberry pi does connect to the network (I see it in my router's DHCP clients list), I cannot ssh into it, ping it or access it in any other way.

This is a B+ model with the latest version of Raspbian installed. I'll much appreciate any help.

[lmarmisa]

If you have another Linux computer connected to your LAN, you can use these commands to list the devices connected to LAN (change the subnet number if required):

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sudo nmap -sP 192.168.1.0/24
fping -a -g 192.168.18.0/24 2> /dev/null

If the commands are not available, install them. This is the install command for Debian distros:

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sudo apt-get install nmap fping

[B.Goode]

In my experience, networking with a wired ethernet connection and ssh 'just works' out-of-the-box with recent versions of Raspbian, provided your local area network infrastructure supports it.

It seems you have a dhcp server that is handing out an IP address to the RPi, which is good. Are you confident that there isn't any firewalling or routing policy that prevents clients on your lan from communicating with each other?

Bottom line is that I'd be looking for a problem elsewhere, not on the RPi.

[elektito]

@lmarmisa: I did try nmap and it doesn't find the IP address my modem says it assigned to raspberry pi. I didn't know about fping but I will try it as soon as I get home in a few hours. Still, it's weird that nmap cannot find the RPi although I know for certain it does get an IP from the DHCP server. Or is it possible for RPi to obtain an IP address and then something else stop the TCP/IP stack from working?

@B.Goode: I am as much certain as I can be that there is no firewall and no particular network policy. I set up my home network myself and I didn't do anything fancy. I have lots of devices on my network. At the moment all my devices connect through WiFi but I have had other wired devices before. I can test connecting another wired device when I get home and report back.

[lmarmisa]

If you have a computer with a card reader running Linux, you will be able to insert the raspbian SD, mount the raspbian root partition and then edit the file /mnt/etc/network/interfaces (I suppose you have mounted the partition on /mnt).

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sudo fdisk -l
sudo mount /dev/sdxy /mnt
cd /mnt/etc/network
sudo cp interfaces interfaces.bak
sudo nano interfaces

Finally define a static IP address for your RPi:

http://elinux.org/Configuring_a_Static_ ... spberry_Pi

[DougieLawson]

Is your home router blocking traffic between LAN devices?

Check the configuration pages at http://192.168.1.1 (or whatever your gateway address is).

[elektito]

I'm pretty sure my router does not block traffic between devices since I frequently connect from one device to another.

[itsmedoofer]

Hi,

I had a similar issue when connected with WiFi, I could see the world (ping external sites) but could not ping or SSH into the Pi, connecting with Ethernet it worked fine.

It seems to be an issue introduced in the September release of Raspbian, releases prior to that worked fine, for me its related to the rt2800usb driver not being well in this release.

I didnt find a workaround other than going back to wired, although I have ordered a new WiFi dongle with a different chipset see if thats any better...

[elektito]

Well my problem is not with wifi but with a normal wired ethernet connection.

[itsmedoofer]

I'll shut up then

[elektito]

Hey, don't take it that way. It's reassuring to know that other people have problems too!

[Ollie97]

Try setting up using Ethernet only, then shutdown and connect wifi and Ethernet try ssh it should work, if it does, shut down and remove Ethernet hopefully it should still work

[elektito]

I finally got an HMDI-to-DVI cable, connected the pi to a monitor and managed to set up wifi. At first I was connected to the Internet but still I couldn't ping it from somewhere else. And then I don't know what happened, but everything was working. I swear I didn't do anything!

I'm not sure if Ethernet is going to work or not, but I'm happy at the moment. I hope Ethernet is going to work later because I mean to turn my raspberry pi into a wireless access point/router.

[lmarmisa]

These are useful RPi commands:

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ifconfig        #shows info about network interfaces

iwconfig       #shows a lot of wifi info

sudo nmap -sP 192.168.1.0/24  #shows the list of devices detected on your LAN. Change subnet 192.168.x.0 if necessary