[conspire] desktop and my laptop can't ping one to another
Denny Yang
yangcdenny at gmail.com
Wed Jul 29 09:17:01 PDT 2020
Hi All,
Thanks again for all of your help and time.
I haven't had a chance to stop Docker service and see what will happen. I
am HOPING I will have the time tonight to fix this.
Yes, the bottom line is I can access to the world, but the two machines
can't ping one to another.
I found this out when I was trying to exercise scp and rsync commands.
When I had 2 desktops connected to the router(the same one as of today), I
had no problem exercising ftp and scp with one to another.
Now I am assuming those "virtual bridges" created by default have nothing
to do with this issue?
So the exercises that I am planning on doing later is setup DHCP server on
the desktop, and stop Docker service on these two and see what happens.
Again, thank you for your time, and those suggestions/comments
-Denny
On Wed, Jul 29, 2020 at 8:56 AM Ruben Safir <ruben at mrbrklyn.com> wrote:
> On Wed, Jul 29, 2020 at 08:07:51AM -0700, Michael Paoli wrote:
> > So, what about the ARP table and /etc/ethers - if that's present?
> > What are the Ethernet MAC addresses associated with each IP
> > in question, and are each making it into the ARP table of
> > the other - if they're on same subnet ... (or in /etc/ethers).
> > What does the routing, subnets, masks, etc. for each look like?
> > And gateways/routers?
>
>
> IMO your making this two complicated without reason. He doesn't need
> top confirm the arp tables, and the ethernet mac addresses. This is not
> a demonstration of networking principles for a networking class.
>
> He has two machines and he just needs to see if they can ping each
> other, and there is a wifi gateway in between.
>
>
> > What about sniffing of traffic, most notably relevant ARP
> > related traffic and ICMP traffic - what does that
> > show? Is traffic making it in/out the correct interfaces
> > and to correct target(s)? What about firewall(s) on
> > host(s) and/or along the way?
> >
> > What else can/can't these hosts get to - and especially
> > on the same subnet? What else can/can't they ping?
> >
> > $ dig -x 75.75.75.75 +short
> > cdns01.comcast.net.
> > $ dig -x 75.75.76.76 +short
> > cdns02.comcast.net.
> > $
> >
> > This looks likely to be some home/office Comcast ISP setup.
> > What's between the hosts? Is it some Comcast
> > home/business "router"(/firewall/NAT/SNAt/...) device?
> > Is it firewalling the hosts from each other?
> > If the hosts are on same subnet, what if one connects them direct
> > with a crossover cable, or via just a switch with no firewall on it?
> >
> > >From: "Rick Moen" <rick at linuxmafia.com>
> > >Subject: [conspire] (forw) Re: Federales in Portland?
> > >Date: Tue, 28 Jul 2020 13:57:57 -0700
> >
> > >I'm assuming Denny meant to send this request for help to the public
> > >forum, rather than to me privately.
> > >
> > >----- Forwarded message from Denny Yang <yangcdenny at gmail.com> -----
> > >
> > >Date: Tue, 28 Jul 2020 13:34:43 -0700
> > >From: Denny Yang <yangcdenny at gmail.com>
> > >To: Rick Moen <rick at linuxmafia.com>
> > >Subject: Re: [conspire] Federales in Portland?
> > >
> > > Hi Rick,
> > >
> > >I hope this email finds you well.
> > >
> > >Right now my desktop and my laptop can't ping one to another.
> > >
> > >Here are the settings that I have so far for each machine. The desktop
> is
> > >connected to the router, and the laptop is using WIFI.
> > >
> > >*DESKTOP:*
> > >
> > >*#ip addr show *
> > >$enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
> state UP
> > >group default qlen 1000
> > > link/ether 8c:ec:4b:45:35:4c brd ff:ff:ff:ff:ff:ff
> > > inet 192.168.1.2/24 brd 192.168.1.255 scope global dynamic
> > >noprefixroute enp2s0
> > >
> > >#systemctl status NetworkManager.service = active/running, no error
> messages
> > >
> > >*#netstat -rn*
> > >Kernel IP routing table
> > >Destination Gateway Genmask Flags MSS Window irtt
> > >Iface
> > >0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0
> > >enp2s0
> > >172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0
> > >docker0
> > >192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
> > >enp2s0
> > >192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0
> > >virbr0
> > >
> > >*#/etc/resolv.conf*
> > ># Generated by NetworkManager
> > >nameserver 192.168.1.1
> > >
> > >*# firewall-cmd --zone=public --list-services*
> > >cockpit dhcpv6-client ftp ssh
> > >
> > >*# firewall-cmd --zone=public --list-ports*
> > >514/tcp
> > >
> > >*LAPTOP: *
> > >
> > >*ip addr show*
> > >wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UP
> > >group default qlen 1000
> > > link/ether 7c:67:a2:13:3c:a1 brd ff:ff:ff:ff:ff:ff
> > > inet 10.232.185.182/14 brd 10.235.255.255 scope global dynamic
> > >noprefixroute wlp1s0
> > >
> > >#systemctl status NetworkManager.service = active/running, no error
> messages
> > >
> > >*# netstat -rn*
> > >Kernel IP routing table
> > >Destination Gateway Genmask Flags MSS Window irtt
> > >Iface
> > >0.0.0.0 10.232.0.1 0.0.0.0 UG 0 0 0
> > >wlp1s0
> > >10.232.0.0 0.0.0.0 255.252.0.0 U 0 0 0
> > >wlp1s0
> > >172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0
> > >docker0
> > >192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0
> > >virbr0
> > >
> > >*#/etc/resolv.conf*
> > >Generated by NetworkManager
> > >nameserver 75.75.75.75
> > >nameserver 75.75.76.76
> > >nameserver 2001:558:feed::1
> > ># NOTE: the libc resolver may not support more than 3 nameservers.
> > ># The nameservers listed below may not be recognized.
> > >nameserver 2001:558:feed::2
> > >
> > >*# firewall-cmd --zone=public --list-services*
> > >cockpit dhcpv6-client ftp ssh
> > >
> > >*# firewall-cmd --zone=public --list-ports*
> > >515/tcp 514/tcp
> > >
> > >Again, I apologize for this lengthy email. It's driving me nuts now why
> > >these two machines can't communicate with each other.
> > >I have a feeling that this has to do with the laptop IP 10.net. But
> still
> > >don't know where the problem is.
> >
> >
> > _______________________________________________
> > conspire mailing list
> > conspire at linuxmafia.com
> > http://linuxmafia.com/mailman/listinfo/conspire
>
> --
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com
>
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> http://www.nylxs.com - Leadership Development in Free Software
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> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
>
>
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