How can a UDP Client and a packet sniffer run on the same machine?
up vote
1
down vote
favorite
In my understanding, if you have a UDP socket client that is bound to a particular port, then a second UDP client on the same machine can't bind to the same port.
If this is the case, then how can a packet sniffing program like Wireshark run on the same machine you have a UDP client without issues?
udp packet-analysis
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
1
down vote
favorite
In my understanding, if you have a UDP socket client that is bound to a particular port, then a second UDP client on the same machine can't bind to the same port.
If this is the case, then how can a packet sniffing program like Wireshark run on the same machine you have a UDP client without issues?
udp packet-analysis
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
In my understanding, if you have a UDP socket client that is bound to a particular port, then a second UDP client on the same machine can't bind to the same port.
If this is the case, then how can a packet sniffing program like Wireshark run on the same machine you have a UDP client without issues?
udp packet-analysis
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
In my understanding, if you have a UDP socket client that is bound to a particular port, then a second UDP client on the same machine can't bind to the same port.
If this is the case, then how can a packet sniffing program like Wireshark run on the same machine you have a UDP client without issues?
udp packet-analysis
udp packet-analysis
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Fred
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Fred
1085
asked 4 hours ago
Fred
1085
1085
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Fred is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
Packet sniffing applications tap into the lower layers of the network stack, not at the top like your UDP using applications that connect to UDP at the top of the network stack.
answered 4 hours ago
Ron Maupin♦
61.2k1161109
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "496"
};
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',
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
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
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Fred is a new contributor. Be nice, and check out our Code of Conduct.
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%2fnetworkengineering.stackexchange.com%2fquestions%2f55451%2fhow-can-a-udp-client-and-a-packet-sniffer-run-on-the-same-machine%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
Packet sniffing applications tap into the lower layers of the network stack, not at the top like your UDP using applications that connect to UDP at the top of the network stack.
answered 4 hours ago
Ron Maupin♦
61.2k1161109
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
add a comment |
up vote
3
down vote
accepted
Packet sniffing applications tap into the lower layers of the network stack, not at the top like your UDP using applications that connect to UDP at the top of the network stack.
answered 4 hours ago
Ron Maupin♦
61.2k1161109
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
add a comment |
up vote
3
down vote
accepted
up vote
3
down vote
accepted
Packet sniffing applications tap into the lower layers of the network stack, not at the top like your UDP using applications that connect to UDP at the top of the network stack.
answered 4 hours ago
Ron Maupin♦
61.2k1161109
Packet sniffing applications tap into the lower layers of the network stack, not at the top like your UDP using applications that connect to UDP at the top of the network stack.
answered 4 hours ago
Ron Maupin♦
61.2k1161109
answered 4 hours ago
Ron Maupin♦
61.2k1161109
answered 4 hours ago
Ron Maupin♦
61.2k1161109
answered 4 hours ago
Ron Maupin♦
61.2k1161109
61.2k1161109
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
add a comment |
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Are you saying that the packet sniffing applications work at the network/routing layer?
– Fred
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
Even lower than that. Most can capture the Data-Link frames.
– Ron Maupin♦
4 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
@Fred Usually the packet capturing happens right on top of the NIC, ie. between layer 2 and 3.
– Zac67
3 hours ago
add a comment |
Fred is a new contributor. Be nice, and check out our Code of Conduct.
Fred is a new contributor. Be nice, and check out our Code of Conduct.
Fred is a new contributor. Be nice, and check out our Code of Conduct.
Fred is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Network Engineering Stack Exchange!
- 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.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- 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%2fnetworkengineering.stackexchange.com%2fquestions%2f55451%2fhow-can-a-udp-client-and-a-packet-sniffer-run-on-the-same-machine%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
