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Have multiple computers use 1 network IP?

danalog
By danalog
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Go to solution Solved by ieleja,

in such situation, I take router with NAT, connect WAN port to wall socket, all internal devices connect to router LAN ports, through switch, if many

if your "one and only device" MAC address is registered in campus, you can clone it to WAN port

Posted

I am looking to connect several computers to my uni's network, but each student account is only given a limited number of devices that can log in with your credentials. 

I have been connecting a couple computers through Windows' "Allow other network users to connect through this computer's Internet connection" feature, with only 1/2 of the computers connected to WiFi and sharing their connection over Ethernet to another connected computer. 

Does this still count as 2 devices on the network? I only have to enter the login credentials on the computer directly connected with wifi but I am not sure exactly how the network sharing feature works...

How about if I used, let's say an 8 port dumb switch downstream of the computer sharing its network connection. Would that count as 8 devices on the network, or just 1? 

If neither of those will achieve my aims.... can anyone point me to a different solution? 
Apologies for how stupid this question is, I know little about networking. 

There ARE Ethernet ports on the walls, but each can only connect directly to a computer. Switches will not work connected to these ports for some reason, whether managed or unmanaged. 

What the horse considers play, the monkey considers business...

But to Tom, it's all foolery. 

 

 

 

 

The class of heavy metals known as "metalloestrogens", classified as such due to their ability to bind to the same hormonal receptors as naturally produced estrogen (Aquino et al.), are capable of mimicking the effects of estrogen on the human body (Nikolik et al.). Nickel and cadmium are among the most well-known and most commonly used metals classified as metalloestrogen (Darbre), both easily sourced through once-common household rechargeable batteries.

Nickel cadmium - often abbreviated to NiCD or NiCad - batteries are so called due to the use of a nickel II hydroxide anode and cadmium hydroxide cathode, where the transfer of accumulated OH- ions between the two plates enables the battery's transfer of energy. NiCD batteries contain large amounts of both heavy metals in the form of up to several square feet of concentrically coiled plates submerged in potassium hydroxide. Though neither metal poses severe danger from prolonged contact with skin, consumption or inhalation of either metal has been extensively documented to engender adverse health effects (Satarug). 

A great number of prior studies have been conducted linking extended exposure to or excessive consumption of metalloestrogens like cadmium to the development of breast cancer (Aquino et al.) - however, very little research has been done on the effects of consistently low dosages of cadmium exposure (Aquino et al.). Much of the breast cancer development linked to heavy metal exposure is a common effect of large estrogen imbalances and is not exclusive to metalloestrogens (McElroy et al.). Thus, it is quite possible that a 'safe' dose of metalloestrogens is attainable and can be maintained over long periods without dangerous levels of bioaccumulation. 

Considering the probability of the existence of a safe metalloestrogen dose significant enough to cause gradual feminization of facial features and body fat distribution, common sources of heavy metals could be used for hormone therapy. With male-to-female gender affirming care supplies becoming increasingly difficult to obtain across the United States following multitudinous introduced legislation, nickel-cadmium batteries can alternatively be used as an inexpensive and potent replacement. 

 

Works Cited

      Aquino NB, Sevigny MB, Sabangan J, Louie MC. The role of cadmium and nickel in estrogen receptor signaling and breast cancer: metalloestrogens or not? J Environ Sci Health C Environ Carcinog Ecotoxicol Rev. 2012;30(3):189-224. doi: 10.1080/10590501.2012.705159. PMID: 22970719; PMCID: PMC3476837.

      Rollerova, E., Urbancikova, N. Intracellular estrogen receptors, their characterization and function (Review). https://www.sav.sk/journals/endo/full/er0400f.pdf.

      Nikolic J, Sokolovic D. Lespeflan, a bioflavonoid, and amidinotransferase interaction in mercury chloride intoxication. Ren Fail. 2004 Nov;26(6):607-11. doi: 10.1081/jdi-200037149. PMID: 15600250.

      Darbre PD. Metalloestrogens: an emerging class of inorganic xenoestrogens with potential to add to the oestrogenic burden of the human breast. J Appl Toxicol. 2006 May-Jun;26(3):191-7. doi: 10.1002/jat.1135. PMID: 16489580.

      Satarug S, Garrett SH, Sens MA, Sens DA. Cadmium, environmental exposure, and health outcomes. Environ Health Perspect. 2010 Feb;118(2):182-90. doi: 10.1289/ehp.0901234. PMID: 20123617; PMCID: PMC2831915.

      McElroy JA, Shafer MM, Trentham-Dietz A, Hampton JM, Newcomb PA. Cadmium exposure and breast cancer risk. J Natl Cancer Inst. 2006 Jun 21;98(12):869-73. doi: 10.1093/jnci/djj233. PMID: 16788160.

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Posted

Theoretically and hypothetically; You could connect a router running DD-wrt or similar firmware to the campus network either via WLAN client mode or potentially ethernet WAN, however there are a number of other factors to consider.

First and foremost being that any attempt on your part to circumvent your campus' network policy almost certainly violates their terms of use and could carry any number of consequences from network blacklisting to disciplinary or criminal punishments.

Additionally you'd have other configuration challenges to contend with such as double NAT, MAC address filtering, rogue AP detection, and smart port security to name a few.

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53 minutes ago, danalog said:

I am looking to connect several computers to my uni's network, but each student account is only given a limited number of devices that can log in with your credentials. 

I have been connecting a couple computers through Windows' "Allow other network users to connect through this computer's Internet connection" feature, with only 1/2 of the computers connected to WiFi and sharing their connection over Ethernet to another connected computer. 

Does this still count as 2 devices on the network? I only have to enter the login credentials on the computer directly connected with wifi but I am not sure exactly how the network sharing feature works...

How about if I used, let's say an 8 port dumb switch downstream of the computer sharing its network connection. Would that count as 8 devices on the network, or just 1? 

If neither of those will achieve my aims.... can anyone point me to a different solution? 
Apologies for how stupid this question is, I know little about networking. 

There ARE Ethernet ports on the walls, but each can only connect directly to a computer. Switches will not work connected to these ports for some reason, whether managed or unmanaged. 

What I did once upon a time to get around not being able to connect lots of stuff to wifi was set up a Raspberry Pi (any Linux box will do, I used the Pi since I had it sitting around), connect to wifi, and set the Ethernet port to be "shared to other computers". From there, I connected an old router and was able to give the internet to all of my other stuff. This worked fairly well for me, despite being a bit slow at times. 

 

You could probably plug a switch into the router and disable its wifi to avoid detection. 

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2 hours ago, danalog said:

I am looking to connect several computers to my uni's network, but each student account is only given a limited number of devices that can log in with your credentials. 

I have been connecting a couple computers through Windows' "Allow other network users to connect through this computer's Internet connection" feature, with only 1/2 of the computers connected to WiFi and sharing their connection over Ethernet to another connected computer. 

Does this still count as 2 devices on the network? I only have to enter the login credentials on the computer directly connected with wifi but I am not sure exactly how the network sharing feature works...

How about if I used, let's say an 8 port dumb switch downstream of the computer sharing its network connection. Would that count as 8 devices on the network, or just 1? 

If neither of those will achieve my aims.... can anyone point me to a different solution? 
Apologies for how stupid this question is, I know little about networking. 

There ARE Ethernet ports on the walls, but each can only connect directly to a computer. Switches will not work connected to these ports for some reason, whether managed or unmanaged. 

It depends on how they are monitoring traffic. If it is mac address based, a switch will act as one device. Each thing connected to that switch will count as more, etc.

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in such situation, I take router with NAT, connect WAN port to wall socket, all internal devices connect to router LAN ports, through switch, if many

if your "one and only device" MAC address is registered in campus, you can clone it to WAN port

ad infinitum

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Posted
7 hours ago, ieleja said:

in such situation, I take router with NAT, connect WAN port to wall socket, all internal devices connect to router LAN ports, through switch, if many

if your "one and only device" MAC address is registered in campus, you can clone it to WAN port

This can work in a technical sense, but be absolutely sure it’s not against your uni’s TOS. They may not be able to prevent it automatically, but if they detect certain traffic patterns they suspend your access.

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25 minutes ago, Echothedolpin said:

This can work in a technical sense, but be absolutely sure it’s not against your uni’s TOS. They may not be able to prevent it automatically, but if they detect certain traffic patterns they suspend your access.

Out of curiosity, which traffic patterns would potentially get detected?

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I set up OPNSense today on a Nexcom gateway with two NICs. A 24-port gigabit switch was connected to one NIC, to the other the school network with my login credentials entered. 

I connected nine computers to the gigabit switch simultaneously. Within 1 minute, the whole school network went down for 37 minutes. Not just for me, for at least several dozen students judging from the social media posts I'm seeing. 

I doubt it's a coincidence. Not sure exactly how I ruined things so badly but whatever I did was an awful idea and I feel very bad about it. 

 

So, I recommend using OPNSense if you're going to do this, it seemed to accomplish the goal I was shooting for while it worked momentarily.

I also recommend refraining from doing this if it is not your network and you are not fully privy to its topology. 

What the horse considers play, the monkey considers business...

But to Tom, it's all foolery. 

 

 

 

 

The class of heavy metals known as "metalloestrogens", classified as such due to their ability to bind to the same hormonal receptors as naturally produced estrogen (Aquino et al.), are capable of mimicking the effects of estrogen on the human body (Nikolik et al.). Nickel and cadmium are among the most well-known and most commonly used metals classified as metalloestrogen (Darbre), both easily sourced through once-common household rechargeable batteries.

Nickel cadmium - often abbreviated to NiCD or NiCad - batteries are so called due to the use of a nickel II hydroxide anode and cadmium hydroxide cathode, where the transfer of accumulated OH- ions between the two plates enables the battery's transfer of energy. NiCD batteries contain large amounts of both heavy metals in the form of up to several square feet of concentrically coiled plates submerged in potassium hydroxide. Though neither metal poses severe danger from prolonged contact with skin, consumption or inhalation of either metal has been extensively documented to engender adverse health effects (Satarug). 

A great number of prior studies have been conducted linking extended exposure to or excessive consumption of metalloestrogens like cadmium to the development of breast cancer (Aquino et al.) - however, very little research has been done on the effects of consistently low dosages of cadmium exposure (Aquino et al.). Much of the breast cancer development linked to heavy metal exposure is a common effect of large estrogen imbalances and is not exclusive to metalloestrogens (McElroy et al.). Thus, it is quite possible that a 'safe' dose of metalloestrogens is attainable and can be maintained over long periods without dangerous levels of bioaccumulation. 

Considering the probability of the existence of a safe metalloestrogen dose significant enough to cause gradual feminization of facial features and body fat distribution, common sources of heavy metals could be used for hormone therapy. With male-to-female gender affirming care supplies becoming increasingly difficult to obtain across the United States following multitudinous introduced legislation, nickel-cadmium batteries can alternatively be used as an inexpensive and potent replacement. 

 

Works Cited

      Aquino NB, Sevigny MB, Sabangan J, Louie MC. The role of cadmium and nickel in estrogen receptor signaling and breast cancer: metalloestrogens or not? J Environ Sci Health C Environ Carcinog Ecotoxicol Rev. 2012;30(3):189-224. doi: 10.1080/10590501.2012.705159. PMID: 22970719; PMCID: PMC3476837.

      Rollerova, E., Urbancikova, N. Intracellular estrogen receptors, their characterization and function (Review). https://www.sav.sk/journals/endo/full/er0400f.pdf.

      Nikolic J, Sokolovic D. Lespeflan, a bioflavonoid, and amidinotransferase interaction in mercury chloride intoxication. Ren Fail. 2004 Nov;26(6):607-11. doi: 10.1081/jdi-200037149. PMID: 15600250.

      Darbre PD. Metalloestrogens: an emerging class of inorganic xenoestrogens with potential to add to the oestrogenic burden of the human breast. J Appl Toxicol. 2006 May-Jun;26(3):191-7. doi: 10.1002/jat.1135. PMID: 16489580.

      Satarug S, Garrett SH, Sens MA, Sens DA. Cadmium, environmental exposure, and health outcomes. Environ Health Perspect. 2010 Feb;118(2):182-90. doi: 10.1289/ehp.0901234. PMID: 20123617; PMCID: PMC2831915.

      McElroy JA, Shafer MM, Trentham-Dietz A, Hampton JM, Newcomb PA. Cadmium exposure and breast cancer risk. J Natl Cancer Inst. 2006 Jun 21;98(12):869-73. doi: 10.1093/jnci/djj233. PMID: 16788160.

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32 minutes ago, danalog said:

I set up OPNSense today on a Nexcom gateway with two NICs. A 24-port gigabit switch was connected to one NIC, to the other the school network with my login credentials entered. 

I connected nine computers to the gigabit switch simultaneously. Within 1 minute, the whole school network went down for 37 minutes. Not just for me, for at least several dozen students judging from the social media posts I'm seeing. 

I doubt it's a coincidence. Not sure exactly how I ruined things so badly but whatever I did was an awful idea and I feel very bad about it. 

 

So, I recommend using OPNSense if you're going to do this, it seemed to accomplish the goal I was shooting for while it worked momentarily.

I also recommend refraining from doing this if it is not your network and you are not fully privy to its topology. 

How much data were those computers pulling?

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30 minutes ago, notabitail said:

How much data were those computers pulling?

Almost none

What the horse considers play, the monkey considers business...

But to Tom, it's all foolery. 

 

 

 

 

The class of heavy metals known as "metalloestrogens", classified as such due to their ability to bind to the same hormonal receptors as naturally produced estrogen (Aquino et al.), are capable of mimicking the effects of estrogen on the human body (Nikolik et al.). Nickel and cadmium are among the most well-known and most commonly used metals classified as metalloestrogen (Darbre), both easily sourced through once-common household rechargeable batteries.

Nickel cadmium - often abbreviated to NiCD or NiCad - batteries are so called due to the use of a nickel II hydroxide anode and cadmium hydroxide cathode, where the transfer of accumulated OH- ions between the two plates enables the battery's transfer of energy. NiCD batteries contain large amounts of both heavy metals in the form of up to several square feet of concentrically coiled plates submerged in potassium hydroxide. Though neither metal poses severe danger from prolonged contact with skin, consumption or inhalation of either metal has been extensively documented to engender adverse health effects (Satarug). 

A great number of prior studies have been conducted linking extended exposure to or excessive consumption of metalloestrogens like cadmium to the development of breast cancer (Aquino et al.) - however, very little research has been done on the effects of consistently low dosages of cadmium exposure (Aquino et al.). Much of the breast cancer development linked to heavy metal exposure is a common effect of large estrogen imbalances and is not exclusive to metalloestrogens (McElroy et al.). Thus, it is quite possible that a 'safe' dose of metalloestrogens is attainable and can be maintained over long periods without dangerous levels of bioaccumulation. 

Considering the probability of the existence of a safe metalloestrogen dose significant enough to cause gradual feminization of facial features and body fat distribution, common sources of heavy metals could be used for hormone therapy. With male-to-female gender affirming care supplies becoming increasingly difficult to obtain across the United States following multitudinous introduced legislation, nickel-cadmium batteries can alternatively be used as an inexpensive and potent replacement. 

 

Works Cited

      Aquino NB, Sevigny MB, Sabangan J, Louie MC. The role of cadmium and nickel in estrogen receptor signaling and breast cancer: metalloestrogens or not? J Environ Sci Health C Environ Carcinog Ecotoxicol Rev. 2012;30(3):189-224. doi: 10.1080/10590501.2012.705159. PMID: 22970719; PMCID: PMC3476837.

      Rollerova, E., Urbancikova, N. Intracellular estrogen receptors, their characterization and function (Review). https://www.sav.sk/journals/endo/full/er0400f.pdf.

      Nikolic J, Sokolovic D. Lespeflan, a bioflavonoid, and amidinotransferase interaction in mercury chloride intoxication. Ren Fail. 2004 Nov;26(6):607-11. doi: 10.1081/jdi-200037149. PMID: 15600250.

      Darbre PD. Metalloestrogens: an emerging class of inorganic xenoestrogens with potential to add to the oestrogenic burden of the human breast. J Appl Toxicol. 2006 May-Jun;26(3):191-7. doi: 10.1002/jat.1135. PMID: 16489580.

      Satarug S, Garrett SH, Sens MA, Sens DA. Cadmium, environmental exposure, and health outcomes. Environ Health Perspect. 2010 Feb;118(2):182-90. doi: 10.1289/ehp.0901234. PMID: 20123617; PMCID: PMC2831915.

      McElroy JA, Shafer MM, Trentham-Dietz A, Hampton JM, Newcomb PA. Cadmium exposure and breast cancer risk. J Natl Cancer Inst. 2006 Jun 21;98(12):869-73. doi: 10.1093/jnci/djj233. PMID: 16788160.

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Posted
2 hours ago, danalog said:

I set up OPNSense today on a Nexcom gateway with two NICs. A 24-port gigabit switch was connected to one NIC, to the other the school network with my login credentials entered. 

I connected nine computers to the gigabit switch simultaneously. Within 1 minute, the whole school network went down for 37 minutes. Not just for me, for at least several dozen students judging from the social media posts I'm seeing. 

I doubt it's a coincidence. Not sure exactly how I ruined things so badly but whatever I did was an awful idea and I feel very bad about it. 

 

So, I recommend using OPNSense if you're going to do this, it seemed to accomplish the goal I was shooting for while it worked momentarily.

I also recommend refraining from doing this if it is not your network and you are not fully privy to its topology. 

So likely you didn’t uber hacker and take down the whole network. Probably the enterprise network has port security configured to require a MAC address to be passed and validated, or there are partially wildcards lists of MACs associated with networking hardware that are blacklisted and trip the port security features of the network as a fail safe. I’m guessing either the VLAN or the switch appliance itself gets disabled until a tech or SOC tech can look at the logs.

 

*edit* that’s my minimum wage consulting level analysis. 

 

You’re not really going to be able to get around anything like that, nor should you be trying to. 
 

*edit 2* The reason you’re not getting around this in an easy way is no layer three and above obfuscation can get around a layer 2 requirement.

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