Destination Host Unreachable on Ubuntu Netplan, same subnet, same routes
I've been banging my head against this problem for days and can't find a solution.
I have a network with a server with two interfaces, one for normal traffic and one with an address 10.72.0.23/12 (for nfs), and a similar client with also two interfaces, one with an address at 10.76.0.17/12.
I've tried about a billion iterations of the netplan options, but at the core I'm constantly stalled by the fact that these two interfaces refuse to connect to each other in this configuration.
If I configure interfaces like so, they connect:
server: 10.72.0.23/12
client: 10.72.0.17/12
or
server: 10.76.0.23/12
client: 10.76.0.17/12
But if I set them up like this, they refuse to communicate (Destination host unreachable):
server: 10.72.0.23/12
client: 10.76.0.17/12
Sadly, for my purposes, I'm unable to configure them the first way permanently - the client and server addresses need to have more than 255 available IPs. These addresses are supposed to connect as they have the same subnet (10.64.0.0/12), yet they do not do so.
There's no firewall. There's no ip conflict. They're on the same subnet. They have the same routes configured. Since they can connect when they have the same first two octets, I know the hardware is working. Everything stops dead the moment I give them the IPs above (or nearby ones).
Is this a bug, or is there some undocumented feature of linux routing at play here?
networking netplan systemd-networkd
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
add a comment |
I've been banging my head against this problem for days and can't find a solution.
I have a network with a server with two interfaces, one for normal traffic and one with an address 10.72.0.23/12 (for nfs), and a similar client with also two interfaces, one with an address at 10.76.0.17/12.
I've tried about a billion iterations of the netplan options, but at the core I'm constantly stalled by the fact that these two interfaces refuse to connect to each other in this configuration.
If I configure interfaces like so, they connect:
server: 10.72.0.23/12
client: 10.72.0.17/12
or
server: 10.76.0.23/12
client: 10.76.0.17/12
But if I set them up like this, they refuse to communicate (Destination host unreachable):
server: 10.72.0.23/12
client: 10.76.0.17/12
Sadly, for my purposes, I'm unable to configure them the first way permanently - the client and server addresses need to have more than 255 available IPs. These addresses are supposed to connect as they have the same subnet (10.64.0.0/12), yet they do not do so.
There's no firewall. There's no ip conflict. They're on the same subnet. They have the same routes configured. Since they can connect when they have the same first two octets, I know the hardware is working. Everything stops dead the moment I give them the IPs above (or nearby ones).
Is this a bug, or is there some undocumented feature of linux routing at play here?
networking netplan systemd-networkd
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36
add a comment |
I've been banging my head against this problem for days and can't find a solution.
I have a network with a server with two interfaces, one for normal traffic and one with an address 10.72.0.23/12 (for nfs), and a similar client with also two interfaces, one with an address at 10.76.0.17/12.
I've tried about a billion iterations of the netplan options, but at the core I'm constantly stalled by the fact that these two interfaces refuse to connect to each other in this configuration.
If I configure interfaces like so, they connect:
server: 10.72.0.23/12
client: 10.72.0.17/12
or
server: 10.76.0.23/12
client: 10.76.0.17/12
But if I set them up like this, they refuse to communicate (Destination host unreachable):
server: 10.72.0.23/12
client: 10.76.0.17/12
Sadly, for my purposes, I'm unable to configure them the first way permanently - the client and server addresses need to have more than 255 available IPs. These addresses are supposed to connect as they have the same subnet (10.64.0.0/12), yet they do not do so.
There's no firewall. There's no ip conflict. They're on the same subnet. They have the same routes configured. Since they can connect when they have the same first two octets, I know the hardware is working. Everything stops dead the moment I give them the IPs above (or nearby ones).
Is this a bug, or is there some undocumented feature of linux routing at play here?
networking netplan systemd-networkd
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
I've been banging my head against this problem for days and can't find a solution.
I have a network with a server with two interfaces, one for normal traffic and one with an address 10.72.0.23/12 (for nfs), and a similar client with also two interfaces, one with an address at 10.76.0.17/12.
I've tried about a billion iterations of the netplan options, but at the core I'm constantly stalled by the fact that these two interfaces refuse to connect to each other in this configuration.
If I configure interfaces like so, they connect:
server: 10.72.0.23/12
client: 10.72.0.17/12
or
server: 10.76.0.23/12
client: 10.76.0.17/12
But if I set them up like this, they refuse to communicate (Destination host unreachable):
server: 10.72.0.23/12
client: 10.76.0.17/12
Sadly, for my purposes, I'm unable to configure them the first way permanently - the client and server addresses need to have more than 255 available IPs. These addresses are supposed to connect as they have the same subnet (10.64.0.0/12), yet they do not do so.
There's no firewall. There's no ip conflict. They're on the same subnet. They have the same routes configured. Since they can connect when they have the same first two octets, I know the hardware is working. Everything stops dead the moment I give them the IPs above (or nearby ones).
Is this a bug, or is there some undocumented feature of linux routing at play here?
networking netplan systemd-networkd
networking netplan systemd-networkd
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
asked Jan 12 at 1:22
Aaron ThomasAaron Thomas
61
61
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36
add a comment |
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1109029%2fdestination-host-unreachable-on-ubuntu-netplan-same-subnet-same-routes%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Ask Ubuntu!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1109029%2fdestination-host-unreachable-on-ubuntu-netplan-same-subnet-same-routes%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Which Ubuntu release, and which versions of the netplan.io and systemd packages are installed? What are the netmasks on the interfaces as shown by 'ip addr show'?
– slangasek
Jan 13 at 1:17
(the reason for this question is I believe there was a bug that caused /24 netmasks to be used unconditionally, but that this bug has been fixed in latest versions of the packages)
– slangasek
Jan 13 at 6:36