School of Science and Engineering Campus
The Campus Wireless LAN system (Titanet4 wireless) was renewed in FY2021. The access points (APs) support Wi-Fi 6, and the cabling was also refreshed at the same time, so the performance of the underlying system equipment is unlikely to be a bottleneck in normal use.
Except for failures affecting the entire School of Science and Engineering campus, symptoms such as no connectivity or unstable communication should first be investigated by individual users on their own devices, or by the organization responsible for the location where the AP is installed (checking factors such as usage levels and radio interference). The final decision on what to prioritize rests with the organization managing the installation site. Each organization is asked to consider this carefully and to inform its users and stakeholders.
- *1 In the event of a campus-wide outage, an announcement will be posted on the NOC website or via (@ScienceTokyoNOC).
- *2 No clear policy or guideline regarding the use of campus wireless LAN has been provided by the central administration.
- *3 The Campus Wireless LAN service has no priority or enforcement authority over channels, signal strength, and the like.
By using the Campus Wireless LAN service, the using organizations and users agree to the rules defined for the service. Please read them carefully; if you cannot abide by the rules, please use a different network.
What You Can Do with the Campus Wireless LAN
The Campus Wireless LAN provides access to a variety of networks in locations where access points (APs) are installed. Each service has its own rules and authentication methods, but together they offer substantial flexibility in terms of purpose, location, and device.
Important Notes
Please read and understand the terms of use and the rules for each service, and use the network with due attention to security and related matters.
Wireless LAN is strongly affected by usage levels and radio interference. For example, wired connections are superior to wireless in the following cases, so please consider deploying wired infrastructure within your organization where appropriate:
- When stability is a priority
- When speed is a priority
- When you wish to avoid the authentication procedure
We may contact individual organizations or users with requests or inquiries. Please be aware that if you do not cooperate, further use may be denied or support requests may not be accepted.
- There are no restrictions on use cases such as publishing materials or applying access restrictions. The responsibility rests with the organization that made the decision.
- Please consider and decide on the scope of disclosure, the impact, and the consequences of any actions within your own organization.
- Access restrictions based on IP address cannot restrict access by individual or by location.
Device sharing, spoofing, and bypass via VPN are all possible. If you require restriction or identification at a finer level, please consider deploying your own network infrastructure within your organization. - The installation of wireless repeaters, servers, and printers is prohibited.
Operational Structure
Operation
The NOC performs remote, centralized management. As a rule, there is no ongoing operational work that each organization needs to handle on a daily basis.
If your organization is planning work that may affect the Campus Wireless LAN service — such as renovations, return of premises, or relocation (including moving or temporarily removing APs, or modifying LAN cabling) — please contact us as early as possible.
Maintenance
Maintenance (OS Updates of Equipment, etc.)
OS updates on switches, APs, and other equipment are carried out during late-night hours to minimize impact. Announcements will be made in advance, so please check them.
Incidents and Inquiries
When an incident or an individual inquiry occurs, the NOC handles the initial response. We perform first-line triage of the fault and coordinate with the equipment vendor as needed. If on-site inspection or equipment replacement is required, we will contact the responsible administrative group, and we ask for their cooperation.
Other
The service may be suspended without prior notice in the following cases:
- When we determine that high-urgency maintenance is required
- When a restart is requested by the organization managing the installation site or by the responsible administrative office
Channel Assignment for the Campus Wireless LAN
On the School of Science and Engineering campus, the Meraki Auto Channel feature is enabled. Please understand that individual channel adjustments cannot be accommodated.
- General indoor use
In the 2.4 GHz band, channels 1, 6, and 11 are subject to Auto Channel; in the 5 GHz band, W52 and W53 (excluding 56 and 60) and W56 are subject to Auto Channel. - DFS (Dynamic Frequency Selection) policy
DFS is the process of detecting radar signals — such as those used for aviation or weather monitoring, which must be protected from interference from 5 GHz band wireless devices (802.11a/n/ac/h) — and switching the 5 GHz operation to a state that does not interfere with the radar. When a radar signal is detected, the channel is changed; the previously used channel is then taken out of service for 30 minutes, and after the channel switch a 1-minute scan is required to verify that no further interference occurs, causing a communication interruption.
APs that frequently detect DFS events are automatically operated with a reduced channel set.
IP Addresses Used by Each SSID
All services use the global IP address range 131.112.127.0/26 in common.
- ScienceTokyo
On-campus private IP — Ookayama:10.2.0.0/17, Suzukakedai:10.2.128.0/20
- ScienceTokyoX
On-campus private IP — Ookayama:10.3.0.0/17, Suzukakedai:10.3.128.0/20
Construction / Facility Work
Before contacting us, please be sure to check the details on each related page.
If you are planning room renovations, relocations, returns of premises, or any other work that may affect communications, please consult us in advance. If communication is unexpectedly interrupted without prior notice from you, it will be treated as a fault, which incurs considerable operational overhead. Your cooperation is appreciated.
Likewise, please be sure to notify us when registered information (room name/number, responsible administrative group, etc.) changes, or when an AP is no longer needed.
If we determine that equipment has been left in place or that management has been abandoned without any notice from the original managing organization or the registered administrative group, we will not be able to accommodate subsequent support requests or other requests. We appreciate your understanding.
We appreciate your cooperation.
School of Medical and Dental Sciences Campus
If you have any questions, please contact the Medical and Dental Sciences IT Help Desk.
IP Addresses Used for the ScienceTokyo SSID
Global IP: 202.242.187.100 – 110
Private IP:
- Yushima Campus:
172.17.0.0/20 - Konodai Campus:
172.16.254.0/23 - Surugadai Campus:
172.17.226.0/24