chore: switch to math/rand/v2

console/authentication/handlers.go

@@ -11,7 +11,7 @@ import (
 	"image/draw"
 	"image/png"
 	"io/fs"
-	"math/rand"
+	"math/rand/v2"
 	"net/http"
 
 	"akvorado/common/embed"
@@ -31,7 +31,7 @@ func (c *Component) UserAvatarHandlerFunc(gc *gin.Context) {
 	info := gc.MustGet("user").(UserInformation)
 	hash := fnv.New64()
 	hash.Write([]byte(info.Login))
-	randSource := rand.New(rand.NewSource(int64(hash.Sum64())))
+	randSource := rand.New(rand.NewPCG(hash.Sum64(), 0))
 	etag := fmt.Sprintf(`"%x"`, hash.Sum64())
 
 	// Do we have a If-None-Match header?
@@ -70,7 +70,7 @@ func (c *Component) UserAvatarHandlerFunc(gc *gin.Context) {
 			gc.JSON(http.StatusInternalServerError, gin.H{"message": "Cannot build avatar."})
 			return
 		}
-		parts[idx] = p[randSource.Intn(len(p))]
+		parts[idx] = p[randSource.IntN(len(p))]
 	}
 
 	// Compose the images

demoexporter/flows/generate.go

@@ -8,7 +8,7 @@ import (
 	"hash/fnv"
 	"math"
 	"math/bits"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"time"
 
@@ -39,11 +39,8 @@ func randomIP(prefix netip.Prefix, r *rand.Rand) netip.Addr {
 			result[i] = prefix.Addr().AsSlice()[i]
 			continue
 		}
-		shiftMask := prefix.Bits() - i*8
-		if shiftMask < 0 {
-			shiftMask = 0
-		}
-		randomByte := byte(int(r.Int31n(256)))
+		shiftMask := max(0, prefix.Bits()-i*8)
+		randomByte := byte(r.IntN(256))
 		randomByte = randomByte & ^bits.Reverse8(byte((1<<shiftMask)-1))
 		result[i] = randomByte | prefix.Addr().AsSlice()[i]
 	}
@@ -69,7 +66,7 @@ func chooseRandom[T any](r *rand.Rand, slice []T) T {
 	if len(slice) == 1 {
 		return slice[0]
 	}
-	return slice[r.Intn(len(slice))]
+	return slice[r.IntN(len(slice))]
 }
 
 // generateFlows generate a set of flows using the provided
@@ -83,7 +80,7 @@ func generateFlows(flowConfigs []FlowConfiguration, seed int64, now time.Time) [
 	// Initialize the random number generator to a known state
 	hash := fnv.New64()
 	fmt.Fprintf(hash, "%d %d", now.Unix(), seed)
-	r := rand.New(rand.NewSource(int64(hash.Sum64())))
+	r := rand.New(rand.NewPCG(hash.Sum64(), 0))
 
 	nowTime := now.Sub(now.Truncate(time.Hour * 24))
 	for _, flowConfig := range flowConfigs {
@@ -104,7 +101,7 @@ func generateFlows(flowConfigs []FlowConfiguration, seed int64, now time.Time) [
 				},
 			}
 			if flowConfig.Size == 0 {
-				flow.Octets = uint32(r.Int31n(1200) + 300)
+				flow.Octets = uint32(r.Int32N(1200) + 300)
 			} else {
 				flow.Octets = uint32(float64(flowConfig.Size) * (r.NormFloat64()*0.3 + 1))
 				if flow.Octets > 9000 {
@@ -122,12 +119,12 @@ func generateFlows(flowConfigs []FlowConfiguration, seed int64, now time.Time) [
 				if srcPort := chooseRandom(r, flowConfig.SrcPort); srcPort != 0 {
 					flow.SrcPort = srcPort
 				} else {
-					flow.SrcPort = uint16(r.Int31n(2000) + 33000)
+					flow.SrcPort = uint16(r.Int32N(2000) + 33000)
 				}
 				if dstPort := chooseRandom(r, flowConfig.DstPort); dstPort != 0 {
 					flow.DstPort = dstPort
 				} else {
-					flow.DstPort = uint16(r.Int31n(2000) + 33000)
+					flow.DstPort = uint16(r.Int32N(2000) + 33000)
 				}
 			}
 			if flow.SrcAddr.Is4() {

demoexporter/flows/generate_test.go

@@ -6,7 +6,7 @@ package flows
 import (
 	"fmt"
 	"math"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"testing"
 	"time"
@@ -41,7 +41,7 @@ func TestRandomIP(t *testing.T) {
 		"2001:db8:a:b::/64",
 		"2001:db8:a:c:d::1/128",
 	}
-	r := rand.New(rand.NewSource(0))
+	r := rand.New(rand.NewPCG(0, 0))
 	for _, p := range prefixes {
 		prefix := netip.MustParsePrefix(p)
 		for range 1000 {
@@ -89,7 +89,7 @@ func TestChooseRandom(t *testing.T) {
 		{6},
 		{1, 2, 3, 4, 10, 12},
 	}
-	r := rand.New(rand.NewSource(0))
+	r := rand.New(rand.NewPCG(0, 0))
 	for _, tc := range cases {
 		t.Run(fmt.Sprintf("%v", tc), func(t *testing.T) {
 			results := map[int]bool{}
@@ -146,15 +146,15 @@ func TestGenerateFlows(t *testing.T) {
 			},
 			Expected: []generatedFlow{
 				{
-					SrcAddr: netip.MustParseAddr("192.0.2.36"),
-					DstAddr: netip.MustParseAddr("203.0.113.91"),
+					SrcAddr: netip.MustParseAddr("192.0.2.155"),
+					DstAddr: netip.MustParseAddr("203.0.113.59"),
 					EType:   0x800,
 					IPFlow: IPFlow{
-						Octets:        1365,
+						Octets:        1011,
 						Packets:       1,
 						Proto:         6,
 						SrcPort:       443,
-						DstPort:       34905,
+						DstPort:       33550,
 						InputInt:      10,
 						OutputInt:     21,
 						SrcAS:         65201,
@@ -164,17 +164,35 @@ func TestGenerateFlows(t *testing.T) {
 						DstMask:       24,
 					},
 				}, {
-					SrcAddr: netip.MustParseAddr("192.0.2.30"),
-					DstAddr: netip.MustParseAddr("203.0.113.220"),
+					SrcAddr: netip.MustParseAddr("192.0.2.3"),
+					DstAddr: netip.MustParseAddr("203.0.113.52"),
 					EType:   0x800,
 					IPFlow: IPFlow{
-						Octets:        1500,
+						Octets:        1478,
 						Packets:       1,
 						Proto:         6,
 						SrcPort:       443,
-						DstPort:       33618,
+						DstPort:       33200,
 						InputInt:      10,
-						OutputInt:     21,
+						OutputInt:     20,
+						SrcAS:         65201,
+						DstAS:         65202,
+						ForwardStatus: 64,
+						SrcMask:       24,
+						DstMask:       24,
+					},
+				}, {
+					SrcAddr: netip.MustParseAddr("192.0.2.151"),
+					DstAddr: netip.MustParseAddr("203.0.113.245"),
+					EType:   2048,
+					IPFlow: IPFlow{
+						Packets:       1,
+						Octets:        1311,
+						Proto:         6,
+						InputInt:      10,
+						OutputInt:     20,
+						SrcPort:       443,
+						DstPort:       33389,
 						SrcAS:         65201,
 						DstAS:         65202,
 						ForwardStatus: 64,
@@ -202,13 +220,13 @@ func TestGenerateFlows(t *testing.T) {
 			Expected: []generatedFlow{
 				{
 					SrcAddr: netip.MustParseAddr("2001:db8::1"),
-					DstAddr: netip.MustParseAddr("2001:db8:2:0:245b:11f7:351e:dc1a"),
+					DstAddr: netip.MustParseAddr("2001:db8:2:0:9b3b:48ac:f003:34f4"),
 					EType:   0x86dd,
 					IPFlow: IPFlow{
-						Octets:        1170,
+						Octets:        866,
 						Packets:       1,
 						Proto:         6,
-						SrcPort:       34045,
+						SrcPort:       33820,
 						DstPort:       443,
 						InputInt:      20,
 						OutputInt:     11,
@@ -240,13 +258,13 @@ func TestGenerateFlows(t *testing.T) {
 			Expected: []generatedFlow{
 				{
 					SrcAddr: netip.MustParseAddr("2001:db8::1"),
-					DstAddr: netip.MustParseAddr("2001:db8:2:0:245b:11f7:351e:dc1a"),
+					DstAddr: netip.MustParseAddr("2001:db8:2:0:9b3b:48ac:f003:34f4"),
 					EType:   0x86dd,
 					IPFlow: IPFlow{
-						Octets:        1170,
+						Octets:        866,
 						Packets:       1,
 						Proto:         6,
-						SrcPort:       34045,
+						SrcPort:       33820,
 						DstPort:       443,
 						InputInt:      20,
 						OutputInt:     11,
@@ -258,13 +276,13 @@ func TestGenerateFlows(t *testing.T) {
 					},
 				}, {
 					DstAddr: netip.MustParseAddr("2001:db8::1"),
-					SrcAddr: netip.MustParseAddr("2001:db8:2:0:245b:11f7:351e:dc1a"),
+					SrcAddr: netip.MustParseAddr("2001:db8:2:0:9b3b:48ac:f003:34f4"),
 					EType:   0x86dd,
 					IPFlow: IPFlow{
-						Octets:        1170 / 10,
+						Octets:        866 / 10,
 						Packets:       1,
 						Proto:         6,
-						DstPort:       34045,
+						DstPort:       33820,
 						SrcPort:       443,
 						OutputInt:     20,
 						InputInt:      11,

inlet/kafka/functional_test.go

@@ -6,7 +6,7 @@ package kafka
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"sync"
 	"testing"
 	"time"
@@ -49,10 +49,10 @@ func TestFakeKafka(t *testing.T) {
 	msg1 := make([]byte, 50)
 	msg2 := make([]byte, 50)
 	for i := range msg1 {
-		msg1[i] = letters[rand.Intn(len(letters))]
+		msg1[i] = letters[rand.IntN(len(letters))]
 	}
 	for i := range msg2 {
-		msg2[i] = letters[rand.Intn(len(letters))]
+		msg2[i] = letters[rand.IntN(len(letters))]
 	}
 	var wg sync.WaitGroup
 	wg.Add(2)

inlet/kafka/root.go

@@ -8,7 +8,7 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"strings"
 	"time"
 

orchestrator/kafka/functional_test.go

@@ -6,7 +6,7 @@ package kafka
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"testing"
 	"time"
 

outlet/clickhouse/worker.go

@@ -6,7 +6,7 @@ package clickhouse
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"strconv"
 	"time"
 

outlet/kafka/functional_test.go

@@ -6,7 +6,7 @@ package kafka
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"strconv"
 	"strings"
 	"sync/atomic"

outlet/metadata/cache_test.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"io/fs"
 	"math"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"path/filepath"
 	"slices"
@@ -419,8 +419,8 @@ func TestConcurrentOperations(t *testing.T) {
 				nowLock.RLock()
 				now := now
 				nowLock.RUnlock()
-				ip := rand.Intn(10)
-				iface := rand.Intn(100)
+				ip := rand.IntN(10)
+				iface := rand.IntN(100)
 				sc.Put(now, provider.Query{
 					ExporterIP: netip.MustParseAddr(fmt.Sprintf("::ffff:127.0.0.%d", ip)),
 					IfIndex:    uint(iface),
@@ -443,8 +443,8 @@ func TestConcurrentOperations(t *testing.T) {
 				nowLock.RLock()
 				now := now
 				nowLock.RUnlock()
-				ip := rand.Intn(10)
-				iface := rand.Intn(100)
+				ip := rand.IntN(10)
+				iface := rand.IntN(100)
 				sc.Lookup(now, provider.Query{
 					ExporterIP: netip.MustParseAddr(fmt.Sprintf("::ffff:127.0.0.%d", ip)),
 					IfIndex:    uint(iface),

outlet/routing/provider/bioris/root.go

@@ -8,7 +8,7 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"sync"
 	"time"
@@ -244,7 +244,7 @@ func (p *Provider) chooseRouter(agent netip.Addr) (netip.Addr, *RISInstanceRunti
 
 	// Randomly select a ris providing the router ID we selected earlier.
 	// In the future, we might also want to exclude currently unavailable ris instances
-	chosenRis = p.routers[chosenRouterID][rand.Intn(len(p.routers[chosenRouterID]))]
+	chosenRis = p.routers[chosenRouterID][rand.IntN(len(p.routers[chosenRouterID]))]
 
 	if chosenRis == nil || chosenRouterID.IsUnspecified() {
 		return chosenRouterID, nil, errNoInstance

outlet/routing/provider/bmp/prefixes_test.go

@@ -6,7 +6,7 @@ package bmp
 import (
 	"fmt"
 	"iter"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"runtime"
 	"slices"
@@ -30,7 +30,7 @@ var prefixSizeDistribution = [33]int{
 }
 
 func init() {
-	prng := rand.New(rand.NewSource(0))
+	prng := rand.New(rand.NewPCG(0, 0))
 	// Data from https://bgp.potaroo.net/as2.0/bgp-asbyhop-vector.txt
 	asDistanceDistribution := []int{
 		1, 2, 366, 9645, 29251, 28984, 7340, 1423, 383, 63, 14, 2, 4, 4, 4, 4, 1, 0,
@@ -46,7 +46,7 @@ func init() {
 	for i := range uniqueASPaths {
 		// Generate AS path length based on distribution
 		asPathLen := 1
-		r := prng.Intn(totalAS)
+		r := prng.IntN(totalAS)
 		cumulative := 0
 		for len, count := range asDistanceDistribution {
 			cumulative += count
@@ -62,7 +62,7 @@ func init() {
 		// Generate unique AS path
 		asPath := make([]uint32, asPathLen)
 		for j := 0; j < asPathLen; j++ {
-			asPath[j] = uint32(prng.Intn(64494) + 1)
+			asPath[j] = uint32(prng.IntN(64494) + 1)
 		}
 		asPathCache[i] = asPath
 	}
@@ -87,7 +87,7 @@ func randomRealWorldRoutes4(prngPrefixes, prngASPaths *rand.Rand, n int) iter.Se
 		for range n {
 			// Generate prefix length based on distribution
 			prefixLen := 0
-			r := prngPrefixes.Intn(totalRoutes)
+			r := prngPrefixes.IntN(totalRoutes)
 			cumulative := 0
 			for len, count := range prefixSizeDistribution {
 				cumulative += count
@@ -99,34 +99,34 @@ func randomRealWorldRoutes4(prngPrefixes, prngASPaths *rand.Rand, n int) iter.Se
 
 			// Generate random IPv4 prefix
 			ip := netip.AddrFrom4([4]byte{
-				byte(prngPrefixes.Intn(224)),
-				byte(prngPrefixes.Intn(256)),
-				byte(prngPrefixes.Intn(256)),
-				byte(prngPrefixes.Intn(256)),
+				byte(prngPrefixes.IntN(224)),
+				byte(prngPrefixes.IntN(256)),
+				byte(prngPrefixes.IntN(256)),
+				byte(prngPrefixes.IntN(256)),
 			})
 			prefix := netip.PrefixFrom(ip, prefixLen).Masked()
 
 			// Select a random AS path from the pre-generated cache
-			asPath := asPathCache[prngASPaths.Intn(len(asPathCache))]
+			asPath := asPathCache[prngASPaths.IntN(len(asPathCache))]
 
 			// Generate communities (0-5 communities per route)
-			numCommunities := max(0, prngASPaths.Intn(10)-4)
+			numCommunities := max(0, prngASPaths.IntN(10)-4)
 			communities := make([]uint32, numCommunities)
 			for j := range numCommunities {
-				asFromPath := asPath[prngASPaths.Intn(len(asPath))]
-				communities[j] = asFromPath<<16 | uint32(prngASPaths.Intn(3))
+				asFromPath := asPath[prngASPaths.IntN(len(asPath))]
+				communities[j] = asFromPath<<16 | uint32(prngASPaths.IntN(3))
 			}
 			slices.Sort(communities)
 			communities = slices.Compact(communities)
 
 			// Generate large communities (0-3 per route, but they are rare)
-			numLargeCommunities := max(0, prngASPaths.Intn(100)-97)
+			numLargeCommunities := max(0, prngASPaths.IntN(100)-97)
 			largeCommunities := make([]bgp.LargeCommunity, numLargeCommunities)
 			for j := range numLargeCommunities {
 				largeCommunities[j] = bgp.LargeCommunity{
-					ASN:        asPath[prngASPaths.Intn(len(asPath))],
-					LocalData1: uint32(prngASPaths.Intn(2)) + 1,
-					LocalData2: uint32(prngASPaths.Intn(2)) + 1,
+					ASN:        asPath[prngASPaths.IntN(len(asPath))],
+					LocalData1: uint32(prngASPaths.IntN(2)) + 1,
+					LocalData2: uint32(prngASPaths.IntN(2)) + 1,
 				}
 			}
 
@@ -145,23 +145,23 @@ func randomRealWorldRoutes4(prngPrefixes, prngASPaths *rand.Rand, n int) iter.Se
 }
 
 func TestRandomRealWorldRoutes4(t *testing.T) {
-	prng1 := rand.New(rand.NewSource(1))
-	prng2 := rand.New(rand.NewSource(2))
+	prng1 := rand.New(rand.NewPCG(1, 1))
+	prng2 := rand.New(rand.NewPCG(2, 2))
 	routes := []randomRoute{}
 	for route := range randomRealWorldRoutes4(prng1, prng2, 2) {
 		routes = append(routes, route)
 	}
 	expectedRoutes := []randomRoute{
 		{
-			Prefix:           netip.MustParsePrefix("79.199.187.0/24"),
-			ASPath:           []uint32{29418, 57855, 38297},
-			Communities:      []uint32{1927938050, 2509832194},
+			Prefix:           netip.MustParsePrefix("22.172.220.0/24"),
+			ASPath:           []uint32{5310, 16496, 48042, 23205},
+			Communities:      []uint32{347996161, 1081081858, 1520762881, 1520762882, 3148480513},
 			LargeCommunities: []bgp.LargeCommunity{},
 		},
 		{
-			Prefix:           netip.MustParsePrefix("185.172.72.0/24"),
-			ASPath:           []uint32{25258, 9490, 64459, 11892, 37685},
-			Communities:      []uint32{},
+			Prefix:           netip.MustParsePrefix("181.109.115.0/24"),
+			ASPath:           []uint32{9514, 53442, 28732, 62632, 53821},
+			Communities:      []uint32{623509505, 1882980354, 4104650753},
 			LargeCommunities: []bgp.LargeCommunity{},
 		},
 	}
@@ -171,8 +171,8 @@ func TestRandomRealWorldRoutes4(t *testing.T) {
 }
 
 func TestRandomRealWorldRoutes4Distribution(t *testing.T) {
-	prng1 := rand.New(rand.NewSource(42))
-	prng2 := rand.New(rand.NewSource(43))
+	prng1 := rand.New(rand.NewPCG(42, 42))
+	prng2 := rand.New(rand.NewPCG(43, 43))
 
 	totalRoutes := 0
 	for _, v := range prefixSizeDistribution {
@@ -220,10 +220,10 @@ func BenchmarkRIBInsertion(b *testing.B) {
 				for b.Loop() {
 					rib = newRIB()
 					nh := netip.MustParseAddr("::ffff:198.51.100.0")
-					prng1 := rand.New(rand.NewSource(10))
+					prng1 := rand.New(rand.NewPCG(10, 10))
 					prng2 := make([]*rand.Rand, peers)
 					for p := range peers {
-						prng2[p] = rand.New(rand.NewSource(int64(p)))
+						prng2[p] = rand.New(rand.NewPCG(uint64(p), uint64(p)))
 					}
 					for p := range peers {
 						nh = nh.Next()
@@ -236,7 +236,7 @@ func BenchmarkRIBInsertion(b *testing.B) {
 						b.StartTimer()
 
 						for _, r := range randomPrefixes {
-							if prng2[p].Intn(10) == 0 {
+							if prng2[p].IntN(10) == 0 {
 								continue
 							}
 							pfx := netip.PrefixFrom(netip.AddrFrom16(r.Prefix.Addr().As16()), r.Prefix.Bits()+96)
@@ -272,8 +272,8 @@ func BenchmarkRIBInsertion(b *testing.B) {
 
 func BenchmarkRIBLookup(b *testing.B) {
 	for _, routes := range []int{1_000, 10_000, 100_000, 1_000_000} {
-		prng1 := rand.New(rand.NewSource(10))
-		prng2 := rand.New(rand.NewSource(0))
+		prng1 := rand.New(rand.NewPCG(10, 10))
+		prng2 := rand.New(rand.NewPCG(0, 0))
 		randomPrefixes := []randomRoute{}
 		for r := range randomRealWorldRoutes4(prng1, prng2, routes/10) {
 			randomPrefixes = append(randomPrefixes, r)
@@ -284,15 +284,15 @@ func BenchmarkRIBLookup(b *testing.B) {
 			b.Run(name, func(b *testing.B) {
 				rib := newRIB()
 				nh := netip.MustParseAddr("::ffff:198.51.100.0")
-				prng1 := rand.New(rand.NewSource(10))
+				prng1 := rand.New(rand.NewPCG(10, 10))
 				prng2 := make([]*rand.Rand, peers)
 				for p := range peers {
-					prng2[p] = rand.New(rand.NewSource(int64(p)))
+					prng2[p] = rand.New(rand.NewPCG(uint64(p), uint64(p)))
 				}
 				for p := range peers {
 					nh = nh.Next()
 					for r := range randomRealWorldRoutes4(prng1, prng2[p], routes) {
-						if prng2[p].Intn(10) == 0 {
+						if prng2[p].IntN(10) == 0 {
 							continue
 						}
 						pfx := netip.PrefixFrom(netip.AddrFrom16(r.Prefix.Addr().As16()), r.Prefix.Bits()+96)
@@ -333,15 +333,15 @@ func BenchmarkRIBFlush(b *testing.B) {
 					b.StopTimer()
 					rib := newRIB()
 					nh := netip.MustParseAddr("::ffff:198.51.100.0")
-					prng1 := rand.New(rand.NewSource(10))
+					prng1 := rand.New(rand.NewPCG(10, 10))
 					prng2 := make([]*rand.Rand, peers)
 					for p := range peers {
-						prng2[p] = rand.New(rand.NewSource(int64(p)))
+						prng2[p] = rand.New(rand.NewPCG(uint64(p), uint64(p)))
 					}
 					for p := range peers {
 						nh = nh.Next()
 						for r := range randomRealWorldRoutes4(prng1, prng2[p], routes) {
-							if prng2[p].Intn(10) == 0 {
+							if prng2[p].IntN(10) == 0 {
 								continue
 							}
 							pfx := netip.PrefixFrom(netip.AddrFrom16(r.Prefix.Addr().As16()), r.Prefix.Bits()+96)

outlet/routing/provider/bmp/rib_test.go

@@ -5,7 +5,7 @@ package bmp
 
 import (
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"testing"
 	"unsafe"
@@ -331,7 +331,7 @@ func TestRemoveRoutes(t *testing.T) {
 
 func TestRIBHarness(t *testing.T) {
 	for run := range 5 {
-		random := rand.New(rand.NewSource(int64(run)))
+		random := rand.New(rand.NewPCG(uint64(run), 0))
 		run++
 
 		// Ramp up the test
@@ -378,17 +378,17 @@ func TestRIBHarness(t *testing.T) {
 			for j := range peerPerExporter {
 				peer := uint32((i << 16) + int(j))
 				peers = append(peers, peer)
-				toAdd := random.Intn(maxInitialRoutePerPeer)
+				toAdd := random.IntN(maxInitialRoutePerPeer)
 				added := 0
 				for range toAdd {
 					lookup := lookup{
 						peer: peer,
 						addr: netip.MustParseAddr(fmt.Sprintf("2001:db8:f:%x::",
-							random.Intn(300))),
+							random.IntN(300))),
 						nextHop: netip.MustParseAddr(
-							fmt.Sprintf("2001:db8:c::%x", random.Intn(500))),
-						rd:      RD(random.Intn(3)),
-						asn:     uint32(random.Intn(1000)),
+							fmt.Sprintf("2001:db8:c::%x", random.IntN(500))),
+						rd:      RD(random.IntN(3)),
+						asn:     uint32(random.IntN(1000)),
 						comment: "added during first pass",
 					}
 					added += r.AddPrefix(netip.PrefixFrom(lookup.addr, 64),
@@ -405,12 +405,12 @@ func TestRIBHarness(t *testing.T) {
 				}
 				t.Logf("Run %d: added = %d/%d", run, added, toAdd)
 
-				toRemove := random.Intn(maxRemovedRoutePerPeer)
+				toRemove := random.IntN(maxRemovedRoutePerPeer)
 				removed := 0
 				for range toRemove {
 					prefix := netip.MustParseAddr(fmt.Sprintf("2001:db8:f:%x::",
-						random.Intn(300)))
-					rd := RD(random.Intn(4))
+						random.IntN(300)))
+					rd := RD(random.IntN(4))
 					if nlriRef, ok := r.nlris.Ref(nlri{
 						rd: rd,
 					}); ok {
@@ -428,16 +428,16 @@ func TestRIBHarness(t *testing.T) {
 				}
 				t.Logf("Run %d: removed = %d/%d", run, removed, toRemove)
 
-				toAdd = random.Intn(maxReaddedRoutePerPeer)
+				toAdd = random.IntN(maxReaddedRoutePerPeer)
 				added = 0
 				for range toAdd {
 					lookup := lookup{
 						peer: peer,
 						addr: netip.MustParseAddr(fmt.Sprintf("2001:db8:f:%x::",
-							random.Intn(300))),
+							random.IntN(300))),
 						nextHop: netip.MustParseAddr(
 							fmt.Sprintf("2001:db8:c::%x", random.Uint32()%500)),
-						asn:     uint32(random.Intn(1010)),
+						asn:     uint32(random.IntN(1010)),
 						comment: "added during third pass",
 					}
 					added += r.AddPrefix(netip.PrefixFrom(lookup.addr, 64),