traefik/docs/content/middlewares/http/ipallowlist.md

title	description
Traefik HTTP Middlewares IPAllowList	Learn how to use IPAllowList in HTTP middleware for limiting clients to specific IPs in Traefik Proxy. Read the technical documentation.

IPAllowList

Limiting Clients to Specific IPs {: .subtitle }

IPAllowList limits allowed requests based on the client IP.

Configuration Examples

# Accepts request from defined IP
labels:
  - "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourcerange=127.0.0.1/32, 192.168.1.7"

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-ipallowlist
spec:
  ipAllowList:
    sourceRange:
      - 127.0.0.1/32
      - 192.168.1.7

# Accepts request from defined IP
- "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourcerange=127.0.0.1/32, 192.168.1.7"

# Accepts request from defined IP
http:
  middlewares:
    test-ipallowlist:
      ipAllowList:
        sourceRange:
          - "127.0.0.1/32"
          - "192.168.1.7"

# Accepts request from defined IP
[http.middlewares]
  [http.middlewares.test-ipallowlist.ipAllowList]
    sourceRange = ["127.0.0.1/32", "192.168.1.7"]

Configuration Options

sourceRange

Required

The sourceRange option sets the allowed IPs (or ranges of allowed IPs by using CIDR notation).

ipStrategy

The ipStrategy option defines two parameters that set how Traefik determines the client IP: depth, and excludedIPs.
If no strategy is set, the default behavior is to match sourceRange against the Remote address found in the request.

!!! important "As a middleware, whitelisting happens before the actual proxying to the backend takes place. In addition, the previous network hop only gets appended to X-Forwarded-For during the last stages of proxying, i.e. after it has already passed through whitelisting. Therefore, during whitelisting, as the previous network hop is not yet present in X-Forwarded-For, it cannot be matched against sourceRange."

ipStrategy.depth

The depth option tells Traefik to use the X-Forwarded-For header and take the IP located at the depth position (starting from the right).

• If depth is greater than the total number of IPs in X-Forwarded-For, then the client IP will be empty.
• depth is ignored if its value is less than or equal to 0.

!!! example "Examples of Depth & X-Forwarded-For"

If `depth` is set to 2, and the request `X-Forwarded-For` header is `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` then the "real" client IP is `"10.0.0.1"` (at depth 4) but the IP used is `"12.0.0.1"` (`depth=2`).

| `X-Forwarded-For`                       | `depth` | clientIP     |
|-----------------------------------------|---------|--------------|
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `1`     | `"13.0.0.1"` |
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `3`     | `"11.0.0.1"` |
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `5`     | `""`         |

# Allowlisting Based on `X-Forwarded-For` with `depth=2`
labels:
  - "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourcerange=127.0.0.1/32, 192.168.1.7"
  - "traefik.http.middlewares.test-ipallowlist.ipallowlist.ipstrategy.depth=2"

# Allowlisting Based on `X-Forwarded-For` with `depth=2`
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-ipallowlist
spec:
  ipAllowList:
    sourceRange:
      - 127.0.0.1/32
      - 192.168.1.7
    ipStrategy:
      depth: 2

# Allowlisting Based on `X-Forwarded-For` with `depth=2`
- "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourcerange=127.0.0.1/32, 192.168.1.7"
- "traefik.http.middlewares.test-ipallowlist.ipallowlist.ipstrategy.depth=2"

# Allowlisting Based on `X-Forwarded-For` with `depth=2`
http:
  middlewares:
    test-ipallowlist:
      ipAllowList:
        sourceRange:
          - "127.0.0.1/32"
          - "192.168.1.7"
        ipStrategy:
          depth: 2

# Allowlisting Based on `X-Forwarded-For` with `depth=2`
[http.middlewares]
  [http.middlewares.test-ipallowlist.ipAllowList]
    sourceRange = ["127.0.0.1/32", "192.168.1.7"]
    [http.middlewares.test-ipallowlist.ipAllowList.ipStrategy]
      depth = 2

ipStrategy.excludedIPs

excludedIPs configures Traefik to scan the X-Forwarded-For header and select the first IP not in the list.

!!! important "If depth is specified, excludedIPs is ignored."

!!! example "Example of ExcludedIPs & X-Forwarded-For"

| `X-Forwarded-For`                       | `excludedIPs`         | clientIP     |
|-----------------------------------------|-----------------------|--------------|
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `"12.0.0.1,13.0.0.1"` | `"11.0.0.1"` |
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `"15.0.0.1,13.0.0.1"` | `"12.0.0.1"` |
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `"10.0.0.1,13.0.0.1"` | `"12.0.0.1"` |
| `"10.0.0.1,11.0.0.1,12.0.0.1,13.0.0.1"` | `"15.0.0.1,16.0.0.1"` | `"13.0.0.1"` |
| `"10.0.0.1,11.0.0.1"`                   | `"10.0.0.1,11.0.0.1"` | `""`         |

# Exclude from `X-Forwarded-For`
labels:
    - "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourceRange=127.0.0.1/32, 192.168.1.0/24"
    - "traefik.http.middlewares.test-ipallowlist.ipallowlist.ipstrategy.excludedips=127.0.0.1/32, 192.168.1.7"

# Exclude from `X-Forwarded-For`
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-ipallowlist
spec:
  ipAllowList:
    sourceRange:
      - 127.0.0.1/32
      - 192.168.1.0/24
    ipStrategy:
      excludedIPs:
        - 127.0.0.1/32
        - 192.168.1.7

# Exclude from `X-Forwarded-For`
- "traefik.http.middlewares.test-ipallowlist.ipallowlist.sourceRange=127.0.0.1/32, 192.168.1.0/24"
- "traefik.http.middlewares.test-ipallowlist.ipallowlist.ipstrategy.excludedips=127.0.0.1/32, 192.168.1.7"

# Exclude from `X-Forwarded-For`
http:
  middlewares:
    test-ipallowlist:
      ipAllowList:
        sourceRange:
         - 127.0.0.1/32
         - 192.168.1.0/24
        ipStrategy:
          excludedIPs:
            - 127.0.0.1/32
            - 192.168.1.7

# Exclude from `X-Forwarded-For`
[http.middlewares]
  [http.middlewares.test-ipallowlist.ipAllowList]
    sourceRange = ["127.0.0.1/32", "192.168.1.0/24"]
    [http.middlewares.test-ipallowlist.ipAllowList.ipStrategy]
      excludedIPs = ["127.0.0.1/32", "192.168.1.7"]