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The documentation moves from READMEs into a site in docs/: getting
started, a user guide, operations, a reference, and development pages,
written in the style of network vendors' documentation (docs/STYLE.md).
bin/bgp/README.md and docs/RFCs.md are folded into it.

- A theme of its own in the International Typographic Style, in blues,
  with self-hosted Inter and JetBrains Mono, search over Zola's index,
  dark mode, and no resources loaded from other hosts.
- Example configurations in docs/examples/, shown on the pages and
  checked with `bgp --check` in CI.
- A test that fails when a field of config.proto is missing from the
  configuration reference.
- A CI job that builds the site; Zola fails on broken links and anchors.
- A hardened systemd unit, tried under systemd with kernel routes on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Rayhaan JaufeerallyandClaude Opus 5.5 committed 2026-10-03 15:12:43 +02:00
1 parent 9820a5d3bc
commit dc275f99d7
61 files changed
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# Edge network with one transit provider and one session for each address
# family. Route origin validation, ASPA verification, and kernel route
# installation are enabled.
router_id: "198.51.100.1"
local_asn: 64500
peers {
name: "transit-a-v4"
endpoint { address: "203.0.113.0" }
local_address: "203.0.113.1"
remote_asn: 64496
role: PROVIDER
address_families: IPV4_UNICAST
# Above the size of the IPv4 Internet routing table.
import { max_prefixes: 1200000 }
}
peers {
name: "transit-a-v6"
endpoint { address: "2001:db8:ffff:1::1" }
local_address: "2001:db8:ffff:1::2"
remote_asn: 64496
role: PROVIDER
address_families: IPV6_UNICAST
import { max_prefixes: 300000 }
}
originate { prefix: "198.51.100.0/24" }
originate { prefix: "2001:db8:100::/40" }
# RPKI cache on the local host, for example Routinator.
rpki { caches { address: "::1" port: 3323 } }
# Requires Linux and CAP_NET_ADMIN.
kernel {}
# Not authenticated. Bind to a loopback address.
http_endpoint { address: "127.0.0.1" port: 8080 }
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# Network with one transit provider, a session with an Internet exchange
# route server, and a bilateral session with one peer at the exchange.
#
# Routes learned at the exchange have local preference 150, and transit
# routes have the default of 100. Accepted routes are marked with a large
# community that identifies where they were learned (64500:2:x). Advertised
# routes are marked with the advertising router (64500:3:r).
router_id: "198.51.100.1"
local_asn: 64500
peers {
name: "transit-a"
endpoint { address: "2001:db8:ffff:1::1" }
remote_asn: 64496
role: PROVIDER
import {
max_prefixes: 1500000
remove_communities: "64500:2:*"
remove_communities: "64500:3:*"
add_large_communities: "64500:2:100" # Learned from transit-a.
}
}
# The route server does not prepend its AS number. Its routes have the
# addresses of the originating members as next hops, which the role
# ROUTE_SERVER permits.
peers {
name: "ixp-a-rs1"
endpoint { address: "2001:db8:ffff:ff::fe" }
remote_asn: 64511
role: ROUTE_SERVER
import {
max_prefixes: 250000
accept_any_first_as: true
remove_communities: "64500:2:*"
remove_communities: "64500:3:*"
add_large_communities: "64500:2:1001" # Learned at exchange A.
local_pref: 150
}
}
# Bilateral peer at the exchange. The prefix and origin AS lists are
# generated from the IRR with bgpq4.
peers {
name: "ixp-a-as64499"
endpoint { address: "2001:db8:ffff:ff::99" }
remote_asn: 64499
role: PEER
require_role: true
import {
max_prefixes: 100
prefixes { prefix: "2001:db8:9900::/40" max_length: 48 }
origin_asns: 64499
remove_communities: "64500:2:*"
remove_communities: "64500:3:*"
add_large_communities: "64500:2:1001"
local_pref: 150
}
}
originate { prefix: "2001:db8:100::/40" }
# Applies to all neighbors: marks advertised routes with router 1.
export { add_large_communities: "64500:3:1" }
rpki {
caches { address: "::1" port: 3323 }
caches { address: "2001:db8:100::53" port: 3323 }
}
kernel {}
http_endpoint { address: "127.0.0.1" port: 8080 }
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# /etc/systemd/system/ferrix.service
#
# Runs the Ferrix daemon as an unprivileged user, with only the
# capabilities that it requires, and restricts its access to the system.
# The log is written to the journal: journalctl -u ferrix.
[Unit]
Description=Ferrix BGP daemon
Documentation=https://ferrix.rayhaan.net/docs/
Wants=network-online.target
After=network-online.target
[Service]
Type=exec
User=ferrix
Group=ferrix
# Validate the configuration before starting. An invalid configuration
# prevents the start, and the error is written to the journal.
ExecStartPre=/usr/local/bin/bgp --check /etc/ferrix/server.textpb
ExecStart=/usr/local/bin/bgp /etc/ferrix/server.textpb --level info
Restart=on-failure
RestartSec=5s
# Time to notify all neighbors and remove the kernel routes.
TimeoutStopSec=30s
# TCP port 179, and the kernel routing table.
AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_ADMIN
CapabilityBoundingSet=CAP_NET_BIND_SERVICE CAP_NET_ADMIN
NoNewPrivileges=yes
# BGP, RTR, HTTP, and netlink sockets only.
RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
ProtectSystem=strict
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
ProtectClock=yes
ProtectHostname=yes
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
LockPersonality=yes
MemoryDenyWriteExecute=yes
SystemCallArchitectures=native
SystemCallFilter=@system-service
UMask=0077
[Install]
WantedBy=multi-user.target
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# Quick start: Ferrix and a test peer on one host, over loopback.
router_id: "192.0.2.1"
local_asn: 64500
# A port above 1023, so that no privileges are required.
listen_endpoints { address: "127.0.0.1" port: 1790 }
peers {
name: "test-peer"
endpoint { address: "127.0.0.1" port: 1791 }
remote_asn: 65001
import {
max_prefixes: 1000
# The test peer advertises documentation prefixes and uses a private
# AS number. Both are rejected by default.
accept_bogons: true
# The test peer connects from 127.0.0.1 and advertises 10.0.0.2 as the
# next hop.
accept_third_party_next_hop: true
}
}
originate { prefix: "198.51.100.0/24" }
originate {
prefix: "2001:db8:100::/48"
communities: "64500:100"
}
# Status page, HTTP API, and metrics. Not authenticated.
http_endpoint { address: "127.0.0.1" port: 8080 }
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# Transit network with two providers and one customer. Customer routes are
# advertised to all neighbors. Provider routes are advertised to the
# customer only. The BGP roles of the neighbors enforce this.
router_id: "198.51.100.1"
local_asn: 64500
# Advertise learned routes to all neighbors, as BGP roles permit.
export { learned_routes: true }
# Customers can restrict the advertisement of their routes with the large
# communities 64500:0:P (not to AS P), 64500:1:P (only to AS P), and
# 64500:0:0 (to no neighbor), or the standard communities 0:P, 64500:P, and
# 0:64500.
control_communities: true
peers {
name: "transit-a"
endpoint { address: "203.0.113.0" }
remote_asn: 64496
role: PROVIDER
import {
max_prefixes: 1500000
remove_communities: "64500:2:*"
add_large_communities: "64500:2:100"
}
}
peers {
name: "transit-b"
endpoint { address: "203.0.113.2" }
remote_asn: 64497
role: PROVIDER
import {
max_prefixes: 1500000
remove_communities: "64500:2:*"
add_large_communities: "64500:2:200"
}
# Prepend to make the path through transit-b less preferred. This
# statement replaces the top-level export statement for this neighbor.
export { learned_routes: true as_path_prepend: 2 }
}
# Customer with a four-octet AS number. The prefix and origin AS lists
# restrict its routes to its registered address space. Local preference
# 200 makes its routes preferred over the same prefixes from providers.
peers {
name: "customer-65536"
endpoint { address: "203.0.113.5" }
remote_asn: 65536
role: CUSTOMER
require_role: true
import {
max_prefixes: 50
prefixes { prefix: "192.0.2.0/24" }
prefixes { prefix: "2001:db8:a00::/40" max_length: 48 }
origin_asns: 65536
remove_communities: "64500:2:*"
add_large_communities: "64500:2:300"
local_pref: 200
}
}
originate { prefix: "198.51.100.0/24" }
originate { prefix: "2001:db8:100::/40" }
rpki { caches { address: "::1" port: 3323 } }
kernel {}
http_endpoint { address: "127.0.0.1" port: 8080 }