I think in this case there is some confusion about which IP address goes with which host. Rich has an old-school /etc/hosts file to map hostnames to addresses (as shown in a previous email), but it's not matching the output of ip or ifconfig (as shown in a previous email).
It's a difficult thing to troubleshoot remotely without intimate knowledge of how this particular network is configured. which hosts are static vs dhcp, which hosts work vs which ones don't, and which network management daemons are in use. by default slackware uses an rc.inet1 script to define IP addresses at boot time, but networkmanager is available for devices that need more dynamic control (laptops). I don't know which he is using. I strongly suspect that the laptop has obtained an address via DHCP and is therefore not being properly tracked by /etc/hosts in addition to any host stanzas in .ssh/config. These outdated config options probably need to be cleared out. This would also explain why laptop->desktop works. The desktop is a static system that doesn't move around as much. The laptop is on the correct subnet, but the IP is floating around in accordance with the router's DHCP policy. Or there's a typo somewhere. -Ben On Thursday, December 11th, 2025 at 11:58 AM, Robert Citek <[email protected]> wrote: > Since I don't use Slackware regularly, I wanted to confirm that ssh'ing > between two different slackware versions can be done. So I used docker > compose to create two separate docker containers: one running slackware > 14.2 and the other running slackware 15.0. > > Here are my notes as a GitHub gist: > > https://gist.github.com/rwcitek/24e0a108e4cc251a60119b581706368b > > I ran this in a GitHub Codespace and on my local system. In both > environments, ssh'ing between them worked just fine. > > Regards, > - Robert > > > On Thu, Dec 11, 2025 at 12:26 PM Russell Senior [email protected] > > wrote: > > > On 12/11/25 08:39, Rich Shepard wrote: > > > > > On Wed, 10 Dec 2025, Russell Senior wrote: > > > > > > > ( hostname && ip a && ping -c1 salmo && ip n ) > > > > > /tmp/caddis-to-salmo.txt > > > > > > caddis.appl-ecosys.com > > > 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN > > > group default qlen 1000 > > > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 > > > inet 127.0.0.1/8 scope host lo > > > valid_lft forever preferred_lft forever > > > inet6 ::1/128 scope host > > > valid_lft forever preferred_lft forever > > > 2: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP > > > group default qlen 1000 > > > link/ether a4:4e:31:a3:05:58 brd ff:ff:ff:ff:ff:ff > > > inet 192.168.55.111/24 brd 192.168.55.255 scope global dynamic > > > noprefixroute wlan0 > > > valid_lft 85900sec preferred_lft 85900sec > > > inet6 fe80::5747:a646:5cd8:a346/64 scope link noprefixroute > > > valid_lft forever preferred_lft forever > > > 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast > > > state UP group default qlen 1000 > > > link/ether 28:d2:44:2e:b4:62 brd ff:ff:ff:ff:ff:ff > > > inet 192.168.55.112/24 brd 192.168.55.255 scope global dynamic > > > noprefixroute eth0 > > > valid_lft 85899sec preferred_lft 85899sec > > > inet6 fe80::73b6:7e97:9b2c:1f06/64 scope link noprefixroute > > > valid_lft forever preferred_lft forever > > > PING salmo.appl-ecosys.com (192.168.55.1) 56(84) bytes of data. > > > 64 bytes from salmo.appl-ecosys.com (192.168.55.1): icmp_seq=1 ttl=64 > > > time=0.830 ms > > > > > > --- salmo.appl-ecosys.com ping statistics --- > > > 1 packets transmitted, 1 received, 0% packet loss, time 0ms > > > rtt min/avg/max/mdev = 0.830/0.830/0.830/0.000 ms > > > 192.168.55.4 dev eth0 lladdr 74:83:c2:49:2b:61 STALE 192.168.55.1 dev > > > eth0 lladdr 0c:9d:92:83:6e:27 REACHABLE fe80::218:aff:fe36:6a56 dev > > > wlan0 lladdr 00:18:0a:36:6a:56 router STALE fe80::218:aff:fe36:6a56 > > > dev eth0 lladdr 00:18:0a:36:6a:56 router STALE > > > > > > Rich > > > > Okay, now do the equivalent from the other side: > > > > ( hostname && ip a && ping -c1 caddis && ip n ) > > > /tmp/salmo-to-caddis.txt > > > > -- > > Russell
